<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:9d86ef9f-b2e7-4a40-a490-d6464a3371cf,g:8b94b0c0-7542-4af0-8ab0-b8cd3d8bf038-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/Cover" xlink:type="simple" xlink:href="avnw-20251226.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_0c942783-97fc-4647-b216-12ba07de47e0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentInformationTable_0c942783-97fc-4647-b216-12ba07de47e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1991e798-7cb7-4e8f-b3ce-a65c91573a32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_0c942783-97fc-4647-b216-12ba07de47e0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1991e798-7cb7-4e8f-b3ce-a65c91573a32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1991e798-7cb7-4e8f-b3ce-a65c91573a32_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1991e798-7cb7-4e8f-b3ce-a65c91573a32" xlink:to="loc_us-gaap_ClassOfStockDomain_1991e798-7cb7-4e8f-b3ce-a65c91573a32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_6d545a7c-eecc-4f04-9dd0-bfe5db27356e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1991e798-7cb7-4e8f-b3ce-a65c91573a32" xlink:to="loc_us-gaap_ClassOfStockDomain_6d545a7c-eecc-4f04-9dd0-bfe5db27356e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_7c3eacb1-c7f6-4696-abdf-244350a16a14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_6d545a7c-eecc-4f04-9dd0-bfe5db27356e" xlink:to="loc_us-gaap_CommonStockMember_7c3eacb1-c7f6-4696-abdf-244350a16a14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_4d048c5f-bf63-4c37-b79f-e08d4e352282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_6d545a7c-eecc-4f04-9dd0-bfe5db27356e" xlink:to="loc_us-gaap_PreferredStockMember_4d048c5f-bf63-4c37-b79f-e08d4e352282" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_4391634e-95ad-4b61-a8fa-b53865fd5cc0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentType_4391634e-95ad-4b61-a8fa-b53865fd5cc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_fd2c55b7-b86d-4020-a9c7-58123b9e9b20" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentQuarterlyReport_fd2c55b7-b86d-4020-a9c7-58123b9e9b20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_3180dfef-649b-4950-847d-34a92b493d1c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentPeriodEndDate_3180dfef-649b-4950-847d-34a92b493d1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_46387a11-09b5-447a-9f2d-91ce2aa038c5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentTransitionReport_46387a11-09b5-447a-9f2d-91ce2aa038c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_88efad3a-c771-48f9-8e56-9d93b61e6a8a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityFileNumber_88efad3a-c771-48f9-8e56-9d93b61e6a8a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_dbe58860-e776-407f-8186-679db084c8d7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityRegistrantName_dbe58860-e776-407f-8186-679db084c8d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_fb787d54-6182-462d-84f0-2091d8661927" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityIncorporationStateCountryCode_fb787d54-6182-462d-84f0-2091d8661927" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_e43615a4-bcde-4957-a4d1-5ccdac90c1df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityTaxIdentificationNumber_e43615a4-bcde-4957-a4d1-5ccdac90c1df" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_31774f1a-b2ff-415f-a328-ea6d931f5254" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityAddressAddressLine1_31774f1a-b2ff-415f-a328-ea6d931f5254" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_54d56625-a3fb-4f04-aa3e-2dbfd9782a8a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityAddressCityOrTown_54d56625-a3fb-4f04-aa3e-2dbfd9782a8a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_6ac1161f-a7bb-4941-80be-d8b15f192b71" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityAddressStateOrProvince_6ac1161f-a7bb-4941-80be-d8b15f192b71" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_ae2087b6-4e02-465e-9513-f93ac5a06e73" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityAddressPostalZipCode_ae2087b6-4e02-465e-9513-f93ac5a06e73" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_539aa4db-d383-4412-a5e1-9a8454ddc5ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_CityAreaCode_539aa4db-d383-4412-a5e1-9a8454ddc5ed" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_7f0dd09f-e87e-4343-9b68-e47e9622d4b8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_LocalPhoneNumber_7f0dd09f-e87e-4343-9b68-e47e9622d4b8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_427bad36-447f-47ee-a144-30dacc943336" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_Security12bTitle_427bad36-447f-47ee-a144-30dacc943336" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_8b1ca6bd-283a-4c8d-8fb4-4b34ed84d3a8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_TradingSymbol_8b1ca6bd-283a-4c8d-8fb4-4b34ed84d3a8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_17850340-26c6-4835-b09c-cbb68c6914af" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_SecurityExchangeName_17850340-26c6-4835-b09c-cbb68c6914af" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_425962d6-5939-4946-9345-a7cca3af122b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_NoTradingSymbolFlag_425962d6-5939-4946-9345-a7cca3af122b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_77028683-bdf1-44e4-a24f-dc95f7ab7f08" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityCurrentReportingStatus_77028683-bdf1-44e4-a24f-dc95f7ab7f08" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_62b7215f-5400-48d3-ac48-5720270c545d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityInteractiveDataCurrent_62b7215f-5400-48d3-ac48-5720270c545d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_8f10963f-3207-4c87-bfe4-fb9b0855c163" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityFilerCategory_8f10963f-3207-4c87-bfe4-fb9b0855c163" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_37de56ce-55eb-46dc-9a9b-fa07731f9074" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntitySmallBusiness_37de56ce-55eb-46dc-9a9b-fa07731f9074" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_632c944d-6222-4872-91a0-bb53028a8242" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityEmergingGrowthCompany_632c944d-6222-4872-91a0-bb53028a8242" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_b3e87b27-909b-41ce-90db-adb08e9a6741" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityShellCompany_b3e87b27-909b-41ce-90db-adb08e9a6741" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_f652a43d-afd5-42bc-b86f-6cf28fc53804" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_f652a43d-afd5-42bc-b86f-6cf28fc53804" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_b61b019c-d8e5-4ede-be4c-6aa377f95c13" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_EntityCentralIndexKey_b61b019c-d8e5-4ede-be4c-6aa377f95c13" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_4f1ca4a1-7f70-40f0-a00e-4bbb76481557" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_CurrentFiscalYearEndDate_4f1ca4a1-7f70-40f0-a00e-4bbb76481557" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_51ffa6e0-be37-4de0-8100-ff35ffa39168" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentFiscalYearFocus_51ffa6e0-be37-4de0-8100-ff35ffa39168" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_daf55338-724a-4ff5-8214-1da10f1c3056" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_DocumentFiscalPeriodFocus_daf55338-724a-4ff5-8214-1da10f1c3056" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_db9a2035-76e9-47f8-9095-daa754ed624b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_c9dae73c-8e6b-4a9b-aeae-1f604bc9b1a8" xlink:to="loc_dei_AmendmentFlag_db9a2035-76e9-47f8-9095-daa754ed624b" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited" xlink:type="simple" xlink:href="avnw-20251226.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_962b8806-d26f-40a5-8aac-677e99f65171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_StatementTable_962b8806-d26f-40a5-8aac-677e99f65171" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_50fd828c-13dc-4108-8915-b76ae57893bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_962b8806-d26f-40a5-8aac-677e99f65171" xlink:to="loc_srt_ProductOrServiceAxis_50fd828c-13dc-4108-8915-b76ae57893bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_50fd828c-13dc-4108-8915-b76ae57893bd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_50fd828c-13dc-4108-8915-b76ae57893bd" xlink:to="loc_srt_ProductsAndServicesDomain_50fd828c-13dc-4108-8915-b76ae57893bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_72da4ac4-5a99-499e-b7fe-82293c1e082b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_50fd828c-13dc-4108-8915-b76ae57893bd" xlink:to="loc_srt_ProductsAndServicesDomain_72da4ac4-5a99-499e-b7fe-82293c1e082b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_8b4c002e-4fdd-47d4-8400-7494eed02bae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_72da4ac4-5a99-499e-b7fe-82293c1e082b" xlink:to="loc_us-gaap_ProductMember_8b4c002e-4fdd-47d4-8400-7494eed02bae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_e01adb9a-0000-4813-9dbf-ba9875d4822c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_72da4ac4-5a99-499e-b7fe-82293c1e082b" xlink:to="loc_us-gaap_ServiceMember_e01adb9a-0000-4813-9dbf-ba9875d4822c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_abf4c1fd-74fc-4b2b-9bc7-2430b9b34a29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_RevenuesAbstract_abf4c1fd-74fc-4b2b-9bc7-2430b9b34a29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7d41688e-c87c-4ce6-b515-18a92aeecac8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_abf4c1fd-74fc-4b2b-9bc7-2430b9b34a29" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7d41688e-c87c-4ce6-b515-18a92aeecac8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_683c51f6-8d8b-46ce-875b-32105aa7250c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSoldAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_683c51f6-8d8b-46ce-875b-32105aa7250c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_1d8e7d8b-dd8f-41db-9792-53e02c7cfe79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_683c51f6-8d8b-46ce-875b-32105aa7250c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_1d8e7d8b-dd8f-41db-9792-53e02c7cfe79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_681fd94f-b538-4e9d-ab39-8721a9fcf72f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_GrossProfit_681fd94f-b538-4e9d-ab39-8721a9fcf72f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_9b0d045e-3f29-450b-8785-ed2846c3fa7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_9b0d045e-3f29-450b-8785-ed2846c3fa7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_9261365c-1ed4-4c2c-af85-103799609f91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_9261365c-1ed4-4c2c-af85-103799609f91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019be392-0896-73d7-9187-5a5e5b10e1bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:to="loc_us-gaap_RestructuringCharges_019be392-0896-73d7-9187-5a5e5b10e1bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_370488d0-57ac-496e-8273-deeb9ec69cb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7336d0e4-6cf5-4336-9e1c-caf1d46d4be1" xlink:to="loc_us-gaap_OperatingExpenses_370488d0-57ac-496e-8273-deeb9ec69cb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_08b18c18-e220-44a3-bfae-86fb1f34399c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_OperatingIncomeLoss_08b18c18-e220-44a3-bfae-86fb1f34399c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_2014766d-e84e-4fc2-85c8-6d2018f32852" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_2014766d-e84e-4fc2-85c8-6d2018f32852" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_89aefe3e-d6e5-4812-9ad8-78e188ddeaaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_89aefe3e-d6e5-4812-9ad8-78e188ddeaaa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7e597d11-08ed-4003-ad33-26a378e2c22f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_7e597d11-08ed-4003-ad33-26a378e2c22f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_654bc894-bbdd-4e11-8cca-ef74bfa99f62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_654bc894-bbdd-4e11-8cca-ef74bfa99f62" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_898d61a4-c047-48bd-8148-465dbcf19ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_898d61a4-c047-48bd-8148-465dbcf19ca0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_e0be1250-9b48-48bf-9f9f-0b0a43b866f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_e0be1250-9b48-48bf-9f9f-0b0a43b866f2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_86f75f20-8707-4dea-b436-fd4147937b71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_EarningsPerShareAbstract_86f75f20-8707-4dea-b436-fd4147937b71" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_c636a2c3-d426-4d2b-8acc-7ee329fe379b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_86f75f20-8707-4dea-b436-fd4147937b71" xlink:to="loc_us-gaap_EarningsPerShareBasic_c636a2c3-d426-4d2b-8acc-7ee329fe379b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_5294442b-3848-4bb8-beb5-f80074815ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_86f75f20-8707-4dea-b436-fd4147937b71" xlink:to="loc_us-gaap_EarningsPerShareDiluted_5294442b-3848-4bb8-beb5-f80074815ef4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_90e27de4-6cbc-42a5-aa15-bfc3d064f9a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_219d2252-a475-422b-822e-9c513e0d2dac" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_90e27de4-6cbc-42a5-aa15-bfc3d064f9a4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3141639f-8479-47f0-bb54-8154221eddb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_90e27de4-6cbc-42a5-aa15-bfc3d064f9a4" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3141639f-8479-47f0-bb54-8154221eddb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_c5b53496-1456-44c8-bf41-429263c57e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_90e27de4-6cbc-42a5-aa15-bfc3d064f9a4" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_c5b53496-1456-44c8-bf41-429263c57e66" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUnaudited" xlink:type="simple" xlink:href="avnw-20251226.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUnaudited"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_dc933325-6203-4f1c-aa39-7a7db40eb430" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_dd010527-23fe-43a3-bf63-4ccc4fcea741" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_dc933325-6203-4f1c-aa39-7a7db40eb430" xlink:to="loc_us-gaap_StatementTable_dd010527-23fe-43a3-bf63-4ccc4fcea741" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ec8a7d4e-b488-4931-8728-56993868c97d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_dd010527-23fe-43a3-bf63-4ccc4fcea741" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ec8a7d4e-b488-4931-8728-56993868c97d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ec8a7d4e-b488-4931-8728-56993868c97d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec8a7d4e-b488-4931-8728-56993868c97d" xlink:to="loc_us-gaap_EquityComponentDomain_ec8a7d4e-b488-4931-8728-56993868c97d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec8a7d4e-b488-4931-8728-56993868c97d" xlink:to="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_af5ac972-06fe-40fd-868f-48b69e6c2be9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:to="loc_us-gaap_CommonStockMember_af5ac972-06fe-40fd-868f-48b69e6c2be9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_ef176173-5f30-4216-a0a0-844374e46d25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:to="loc_us-gaap_TreasuryStockCommonMember_ef176173-5f30-4216-a0a0-844374e46d25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_a4e1323a-7a19-4522-881b-58c641c51949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_a4e1323a-7a19-4522-881b-58c641c51949" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_bb5d26c8-ff9a-45f0-ba4a-7835eeeec92a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:to="loc_us-gaap_RetainedEarningsMember_bb5d26c8-ff9a-45f0-ba4a-7835eeeec92a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_075c35ae-03f1-419c-a09e-e1a875144188" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3ecfa78b-4b56-4d15-ad7e-f970d786b79d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_075c35ae-03f1-419c-a09e-e1a875144188" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_dc933325-6203-4f1c-aa39-7a7db40eb430" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_a118c984-bfbd-4be3-9a02-cbec0a49ffff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_a118c984-bfbd-4be3-9a02-cbec0a49ffff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fcb77092-eaf4-4a88-8e85-016e3e4b1fca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_StockholdersEquity_fcb77092-eaf4-4a88-8e85-016e3e4b1fca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_44c3ba9d-9628-41d4-8e8b-90cc4c7a2497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_NetIncomeLoss_44c3ba9d-9628-41d4-8e8b-90cc4c7a2497" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_48fedb62-da5a-4ddf-be99-d81765133c10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_48fedb62-da5a-4ddf-be99-d81765133c10" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan_b2b41e48-5147-486b-af7e-c739a3b07383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan_b2b41e48-5147-486b-af7e-c739a3b07383" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan_a6de9f82-c701-481f-813e-041272737e13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan_a6de9f82-c701-481f-813e-041272737e13" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_bce45654-6f2b-45b3-88c1-9a444a764682" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_bce45654-6f2b-45b3-88c1-9a444a764682" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0f1ac88b-b67d-489c-aaaf-e54b5b6414f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_0f1ac88b-b67d-489c-aaaf-e54b5b6414f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_d36b151f-7feb-42bd-a52e-7f825c63c8ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_d36b151f-7feb-42bd-a52e-7f825c63c8ff" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_4e3b6dec-3b23-4e87-953a-973c652499bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_4e3b6dec-3b23-4e87-953a-973c652499bb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7d9ff2ed-f1e3-40ae-ae0a-efc9230c4856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f2b407e2-4939-4abe-9502-e99ecd85409b" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7d9ff2ed-f1e3-40ae-ae0a-efc9230c4856" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_cec01246-23f2-4450-a5f3-fc9441854c72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_f3f162a7-0199-49aa-9355-ea6f9e63e475" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3ba25320-d657-4c46-ab9c-3fc713dd71d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_dd8d4726-2e7a-4c67-bdf0-e89e7c31758c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3ba25320-d657-4c46-ab9c-3fc713dd71d8" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_dd8d4726-2e7a-4c67-bdf0-e89e7c31758c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_cb5a2b93-64e9-4331-9ae5-7f113722f7b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_dd8d4726-2e7a-4c67-bdf0-e89e7c31758c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_cb5a2b93-64e9-4331-9ae5-7f113722f7b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_cb5a2b93-64e9-4331-9ae5-7f113722f7b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_cb5a2b93-64e9-4331-9ae5-7f113722f7b9" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_cb5a2b93-64e9-4331-9ae5-7f113722f7b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_93f763d4-35ba-4ad4-9a93-746bd64c41c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_cb5a2b93-64e9-4331-9ae5-7f113722f7b9" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_93f763d4-35ba-4ad4-9a93-746bd64c41c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_0bed55f4-d4d2-451e-870b-6b89c9e3e6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_93f763d4-35ba-4ad4-9a93-746bd64c41c7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_0bed55f4-d4d2-451e-870b-6b89c9e3e6c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_20832d26-5a0e-4ba4-a942-f05c8117b3a1" xlink:href="avnw-20251226.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_93f763d4-35ba-4ad4-9a93-746bd64c41c7" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_20832d26-5a0e-4ba4-a942-f05c8117b3a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e1147ae5-331f-48cc-a015-f7c76f01ad46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_3ba25320-d657-4c46-ab9c-3fc713dd71d8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e1147ae5-331f-48cc-a015-f7c76f01ad46" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_5e6cdae9-d04a-43c2-805c-db205d478feb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_05444baa-88d6-43ca-ab7e-60837a020fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e6cdae9-d04a-43c2-805c-db205d478feb" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_05444baa-88d6-43ca-ab7e-60837a020fb4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_05444baa-88d6-43ca-ab7e-60837a020fb4" xlink:to="loc_srt_ProductOrServiceAxis_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3" xlink:to="loc_srt_ProductsAndServicesDomain_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e4d77bf6-34aa-42f5-9a3e-65ff76fa5d59" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_ffbb2f8f-f961-4df0-90ae-c5b06eac15f3" xlink:to="loc_srt_ProductsAndServicesDomain_e4d77bf6-34aa-42f5-9a3e-65ff76fa5d59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_eee303f6-a31a-4b96-bbb6-50d07ff3fbd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_e4d77bf6-34aa-42f5-9a3e-65ff76fa5d59" xlink:to="loc_us-gaap_ServiceMember_eee303f6-a31a-4b96-bbb6-50d07ff3fbd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_a553727b-d5a2-4f5f-9312-702302fd4f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e6cdae9-d04a-43c2-805c-db205d478feb" xlink:to="loc_us-gaap_ContractWithCustomerLiability_a553727b-d5a2-4f5f-9312-702302fd4f7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ContractWithCustomerLiabilityCurrentPercent_1c7b6879-235c-44c0-9a77-8af3e4d86da0" xlink:href="avnw-20251226.xsd#avnw_ContractWithCustomerLiabilityCurrentPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e6cdae9-d04a-43c2-805c-db205d478feb" xlink:to="loc_avnw_ContractWithCustomerLiabilityCurrentPercent_1c7b6879-235c-44c0-9a77-8af3e4d86da0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2da2c7cb-b99f-475a-84cb-14c0fb225b19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e6cdae9-d04a-43c2-805c-db205d478feb" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_2da2c7cb-b99f-475a-84cb-14c0fb225b19" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0c723f08-f089-47f9-8342-ffcd888a08ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0c723f08-f089-47f9-8342-ffcd888a08ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3003155a-a8b8-4e36-93fc-bbdfd5165be8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0c723f08-f089-47f9-8342-ffcd888a08ab" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3003155a-a8b8-4e36-93fc-bbdfd5165be8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_b7870b9b-5fb0-40ca-ab2e-b0b68abe73f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_b7870b9b-5fb0-40ca-ab2e-b0b68abe73f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_d32b88ae-ebb7-47d9-87bd-045bd6f8a332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_d32b88ae-ebb7-47d9-87bd-045bd6f8a332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a3b1c252-6348-4b6f-95d4-cc33f84a7304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a3b1c252-6348-4b6f-95d4-cc33f84a7304" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="avnw-20251226.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0c723f08-f089-47f9-8342-ffcd888a08ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_0c723f08-f089-47f9-8342-ffcd888a08ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_b7870b9b-5fb0-40ca-ab2e-b0b68abe73f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_b7870b9b-5fb0-40ca-ab2e-b0b68abe73f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_d32b88ae-ebb7-47d9-87bd-045bd6f8a332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_d32b88ae-ebb7-47d9-87bd-045bd6f8a332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a3b1c252-6348-4b6f-95d4-cc33f84a7304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_b96da8c2-e81d-41d4-a643-c356033c185d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a3b1c252-6348-4b6f-95d4-cc33f84a7304" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsScheduleofPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#BalanceSheetComponentsScheduleofPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsScheduleofPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0daaa391-474a-4c17-ae49-c7c98b63020f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7edb59e8-2a97-416a-9215-bfc045ca80b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0daaa391-474a-4c17-ae49-c7c98b63020f" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7edb59e8-2a97-416a-9215-bfc045ca80b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77166a20-ad6b-449f-ab4d-d7cb1849e6b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_7edb59e8-2a97-416a-9215-bfc045ca80b0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77166a20-ad6b-449f-ab4d-d7cb1849e6b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77166a20-ad6b-449f-ab4d-d7cb1849e6b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77166a20-ad6b-449f-ab4d-d7cb1849e6b6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77166a20-ad6b-449f-ab4d-d7cb1849e6b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0b946639-8a01-4ee5-b59c-f27418a28fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_77166a20-ad6b-449f-ab4d-d7cb1849e6b6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0b946639-8a01-4ee5-b59c-f27418a28fd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_3b718e8e-fc3d-45ba-8047-71a4ecaeb568" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0b946639-8a01-4ee5-b59c-f27418a28fd9" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_3b718e8e-fc3d-45ba-8047-71a4ecaeb568" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_SoftwareAndEquipmentMember_c684fbb8-c1f6-4961-b26e-70725f9dd5ad" xlink:href="avnw-20251226.xsd#avnw_SoftwareAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0b946639-8a01-4ee5-b59c-f27418a28fd9" xlink:to="loc_avnw_SoftwareAndEquipmentMember_c684fbb8-c1f6-4961-b26e-70725f9dd5ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_2071e9ff-2dba-4d26-935c-461add29368e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0daaa391-474a-4c17-ae49-c7c98b63020f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_2071e9ff-2dba-4d26-935c-461add29368e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ab2772c0-aa9c-4b51-9d69-937bd714c889" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0daaa391-474a-4c17-ae49-c7c98b63020f" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ab2772c0-aa9c-4b51-9d69-937bd714c889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_89bd801a-9439-4585-93da-dcdd3454b0ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_0daaa391-474a-4c17-ae49-c7c98b63020f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_89bd801a-9439-4585-93da-dcdd3454b0ee" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#BalanceSheetComponentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_874d2f1e-7fc8-4f1b-ab05-179b105f38a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b735f931-ca49-4b0a-b860-aae10f882fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_874d2f1e-7fc8-4f1b-ab05-179b105f38a8" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b735f931-ca49-4b0a-b860-aae10f882fe9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_701c4448-e7ce-4248-b1b5-dc7990bd3f10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_b735f931-ca49-4b0a-b860-aae10f882fe9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_701c4448-e7ce-4248-b1b5-dc7990bd3f10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_701c4448-e7ce-4248-b1b5-dc7990bd3f10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_701c4448-e7ce-4248-b1b5-dc7990bd3f10" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_701c4448-e7ce-4248-b1b5-dc7990bd3f10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a646af59-c306-4864-b253-698c8955b6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_701c4448-e7ce-4248-b1b5-dc7990bd3f10" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a646af59-c306-4864-b253-698c8955b6b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetUnderConstructionMember_7518f29b-8be3-4cf3-9fa8-1ad2c8765a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetUnderConstructionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a646af59-c306-4864-b253-698c8955b6b9" xlink:to="loc_us-gaap_AssetUnderConstructionMember_7518f29b-8be3-4cf3-9fa8-1ad2c8765a8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_b77e9ade-a1b4-48e7-abfe-36f2a69dc848" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_874d2f1e-7fc8-4f1b-ab05-179b105f38a8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_b77e9ade-a1b4-48e7-abfe-36f2a69dc848" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_ac0d5b5d-f429-4f80-803c-131cc25fafca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_874d2f1e-7fc8-4f1b-ab05-179b105f38a8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_ac0d5b5d-f429-4f80-803c-131cc25fafca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_fdc0649c-d458-4e84-a445-9576a46b2540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_874d2f1e-7fc8-4f1b-ab05-179b105f38a8" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_fdc0649c-d458-4e84-a445-9576a46b2540" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#FairValueMeasurementsofAssetsandLiabilitiesScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ce525c24-c9dd-448c-af5f-9fd4b0d92f10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_289691ab-1a0a-4b46-a219-f77fb6ff7e0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ce525c24-c9dd-448c-af5f-9fd4b0d92f10" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_289691ab-1a0a-4b46-a219-f77fb6ff7e0c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_4bebd48a-816f-4a9a-b584-eb077976357e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_289691ab-1a0a-4b46-a219-f77fb6ff7e0c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_4bebd48a-816f-4a9a-b584-eb077976357e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4bebd48a-816f-4a9a-b584-eb077976357e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_4bebd48a-816f-4a9a-b584-eb077976357e" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4bebd48a-816f-4a9a-b584-eb077976357e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f2901f2a-f5b8-47c7-8305-88b83b418ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_4bebd48a-816f-4a9a-b584-eb077976357e" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f2901f2a-f5b8-47c7-8305-88b83b418ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_a05007b7-e9f4-45b7-9784-245bce37a07f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f2901f2a-f5b8-47c7-8305-88b83b418ca6" xlink:to="loc_us-gaap_MoneyMarketFundsMember_a05007b7-e9f4-45b7-9784-245bce37a07f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_02fd4808-26fc-450a-b63f-4403d34c447d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f2901f2a-f5b8-47c7-8305-88b83b418ca6" xlink:to="loc_us-gaap_BankTimeDepositsMember_02fd4808-26fc-450a-b63f-4403d34c447d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_253e8b8f-5970-4889-b7e2-3d830a31b757" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_289691ab-1a0a-4b46-a219-f77fb6ff7e0c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_253e8b8f-5970-4889-b7e2-3d830a31b757" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_253e8b8f-5970-4889-b7e2-3d830a31b757_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_253e8b8f-5970-4889-b7e2-3d830a31b757" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_253e8b8f-5970-4889-b7e2-3d830a31b757_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_275596f6-3f41-42ff-a9fb-05a06c800a2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_253e8b8f-5970-4889-b7e2-3d830a31b757" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_275596f6-3f41-42ff-a9fb-05a06c800a2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_8d888d6c-4018-463d-afe6-de31489d8c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_275596f6-3f41-42ff-a9fb-05a06c800a2f" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_8d888d6c-4018-463d-afe6-de31489d8c1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_69d21dfd-d3c3-4ae4-9132-efb456cc01df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_275596f6-3f41-42ff-a9fb-05a06c800a2f" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_69d21dfd-d3c3-4ae4-9132-efb456cc01df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_2623741b-92d1-4111-905f-6ed1f31cd7dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_ce525c24-c9dd-448c-af5f-9fd4b0d92f10" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_2623741b-92d1-4111-905f-6ed1f31cd7dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_ab7117e1-ad66-4e9d-bda2-d7333d2554a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2623741b-92d1-4111-905f-6ed1f31cd7dd" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_ab7117e1-ad66-4e9d-bda2-d7333d2554a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_019bf7cf-ef38-78e5-a04e-56244fa105c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_2623741b-92d1-4111-905f-6ed1f31cd7dd" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_019bf7cf-ef38-78e5-a04e-56244fa105c1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#FairValueMeasurementsofAssetsandLiabilitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2359bef6-476b-4738-9b3a-a8026ef2a723" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4ac2c90a-8a51-4c8a-852c-f5fbdcc66c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2359bef6-476b-4738-9b3a-a8026ef2a723" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4ac2c90a-8a51-4c8a-852c-f5fbdcc66c5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4ac2c90a-8a51-4c8a-852c-f5fbdcc66c5a" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_937f996c-ca7b-463e-9c47-59be5385869a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_ea6f9e0c-d84f-4a53-9b34-b9f5982f8aa5" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_937f996c-ca7b-463e-9c47-59be5385869a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_dc09e223-f70e-4179-9c7b-51a94561e00c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_937f996c-ca7b-463e-9c47-59be5385869a" xlink:to="loc_us-gaap_MoneyMarketFundsMember_dc09e223-f70e-4179-9c7b-51a94561e00c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2dee62b5-a327-402c-911c-c621885a1b71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4ac2c90a-8a51-4c8a-852c-f5fbdcc66c5a" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2dee62b5-a327-402c-911c-c621885a1b71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2dee62b5-a327-402c-911c-c621885a1b71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2dee62b5-a327-402c-911c-c621885a1b71" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2dee62b5-a327-402c-911c-c621885a1b71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25db4586-4e77-4651-85b2-1100fe6d10e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2dee62b5-a327-402c-911c-c621885a1b71" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25db4586-4e77-4651-85b2-1100fe6d10e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_d6edd92d-4ed7-4163-b079-cbdfd083ecc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_25db4586-4e77-4651-85b2-1100fe6d10e3" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_d6edd92d-4ed7-4163-b079-cbdfd083ecc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure_5064b775-5d71-4be7-8dab-45f1ecf99df6" xlink:href="avnw-20251226.xsd#avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2359bef6-476b-4738-9b3a-a8026ef2a723" xlink:to="loc_avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure_5064b775-5d71-4be7-8dab-45f1ecf99df6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#CreditFacilityandDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:to="loc_us-gaap_CreditFacilityAxis_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1" xlink:to="loc_us-gaap_CreditFacilityDomain_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_2b9cbcaf-23ff-423a-b78f-b735f40ad3d1" xlink:to="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_dfba17d3-af63-45d5-89e3-b7446d50daff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_dfba17d3-af63-45d5-89e3-b7446d50daff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TermLoanFacilityMember_6d347894-84a6-44f0-831c-705d89b3d14b" xlink:href="avnw-20251226.xsd#avnw_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:to="loc_avnw_TermLoanFacilityMember_6d347894-84a6-44f0-831c-705d89b3d14b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_e4227f16-dddc-4896-9089-f87e31a55f67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:to="loc_us-gaap_LetterOfCreditMember_e4227f16-dddc-4896-9089-f87e31a55f67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_SwingLineLoanMember_1bf92bf5-b178-4ad2-bdeb-b27acf13ccc3" xlink:href="avnw-20251226.xsd#avnw_SwingLineLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:to="loc_avnw_SwingLineLoanMember_1bf92bf5-b178-4ad2-bdeb-b27acf13ccc3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_40cb2bad-2517-4bce-94a7-ae69a4cdfe98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_cd117481-77bf-4bb0-b1db-c29493976e52" xlink:to="loc_us-gaap_LineOfCreditMember_40cb2bad-2517-4bce-94a7-ae69a4cdfe98" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cab68ea7-a7f6-4d7e-a3da-a99b332117b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:to="loc_us-gaap_DebtInstrumentAxis_cab68ea7-a7f6-4d7e-a3da-a99b332117b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cab68ea7-a7f6-4d7e-a3da-a99b332117b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cab68ea7-a7f6-4d7e-a3da-a99b332117b2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cab68ea7-a7f6-4d7e-a3da-a99b332117b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_320b66a5-6a87-4229-a39a-f39fff851ca0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cab68ea7-a7f6-4d7e-a3da-a99b332117b2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_320b66a5-6a87-4229-a39a-f39fff851ca0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_CreditFacilityMember_9b6e4449-5351-4d4b-bad4-44c69ce3356a" xlink:href="avnw-20251226.xsd#avnw_CreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_320b66a5-6a87-4229-a39a-f39fff851ca0" xlink:to="loc_avnw_CreditFacilityMember_9b6e4449-5351-4d4b-bad4-44c69ce3356a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TermLoanFacilityMember_952ce57f-e0c6-4025-be9a-ee1ff11e90df" xlink:href="avnw-20251226.xsd#avnw_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_320b66a5-6a87-4229-a39a-f39fff851ca0" xlink:to="loc_avnw_TermLoanFacilityMember_952ce57f-e0c6-4025-be9a-ee1ff11e90df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_d14c61a4-7401-4339-aef3-9028c2925a20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:to="loc_us-gaap_VariableRateAxis_d14c61a4-7401-4339-aef3-9028c2925a20" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d14c61a4-7401-4339-aef3-9028c2925a20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_d14c61a4-7401-4339-aef3-9028c2925a20" xlink:to="loc_us-gaap_VariableRateDomain_d14c61a4-7401-4339-aef3-9028c2925a20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d86e7e62-3dee-465e-86e2-e708f1d510fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_d14c61a4-7401-4339-aef3-9028c2925a20" xlink:to="loc_us-gaap_VariableRateDomain_d86e7e62-3dee-465e-86e2-e708f1d510fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_3dab72bf-1804-42c2-809b-62d6e1417c91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d86e7e62-3dee-465e-86e2-e708f1d510fe" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_3dab72bf-1804-42c2-809b-62d6e1417c91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_29437a49-b188-4a88-9f80-aa8662f7cf3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d86e7e62-3dee-465e-86e2-e708f1d510fe" xlink:to="loc_us-gaap_BaseRateMember_29437a49-b188-4a88-9f80-aa8662f7cf3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_e1aaaf34-5ced-43a3-8409-59de24f8ce99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_63ce47cb-1999-4eaf-ae66-6f9ebf378ff0" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_e1aaaf34-5ced-43a3-8409-59de24f8ce99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputEbitdaMultipleMember_538e6f0b-2f01-4a75-bcfd-04c18c72116a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputEbitdaMultipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_e1aaaf34-5ced-43a3-8409-59de24f8ce99" xlink:to="loc_us-gaap_MeasurementInputEbitdaMultipleMember_538e6f0b-2f01-4a75-bcfd-04c18c72116a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentLeverageRatioAxis_125bff99-aec8-474d-a3e3-ff3c2c638263" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentLeverageRatioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_f115c8a4-4c51-4984-bab7-5e08138c27a3" xlink:to="loc_avnw_DebtInstrumentLeverageRatioAxis_125bff99-aec8-474d-a3e3-ff3c2c638263" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentLeverageRatioDomain_125bff99-aec8-474d-a3e3-ff3c2c638263_default" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentLeverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_avnw_DebtInstrumentLeverageRatioAxis_125bff99-aec8-474d-a3e3-ff3c2c638263" xlink:to="loc_avnw_DebtInstrumentLeverageRatioDomain_125bff99-aec8-474d-a3e3-ff3c2c638263_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentLeverageRatioDomain_54a144ee-7217-4cfa-b578-1205ef147caf" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentLeverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_avnw_DebtInstrumentLeverageRatioAxis_125bff99-aec8-474d-a3e3-ff3c2c638263" xlink:to="loc_avnw_DebtInstrumentLeverageRatioDomain_54a144ee-7217-4cfa-b578-1205ef147caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_LeverageRatio275Member_9368da05-005e-42bf-983a-655183dd4b13" xlink:href="avnw-20251226.xsd#avnw_LeverageRatio275Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_avnw_DebtInstrumentLeverageRatioDomain_54a144ee-7217-4cfa-b578-1205ef147caf" xlink:to="loc_avnw_LeverageRatio275Member_9368da05-005e-42bf-983a-655183dd4b13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_LeverageRatio250Member_97cbd630-57b8-4361-9eea-876f4f0e9d23" xlink:href="avnw-20251226.xsd#avnw_LeverageRatio250Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_avnw_DebtInstrumentLeverageRatioDomain_54a144ee-7217-4cfa-b578-1205ef147caf" xlink:to="loc_avnw_LeverageRatio250Member_97cbd630-57b8-4361-9eea-876f4f0e9d23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_47ec0bdd-4fa4-49ef-b040-4eea5d8f9db0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_47ec0bdd-4fa4-49ef-b040-4eea5d8f9db0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_86bd65a9-1bba-4de1-9fb8-5eaeddeee8e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_86bd65a9-1bba-4de1-9fb8-5eaeddeee8e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_9bc9d486-16e3-459d-9daa-2b9234be1206" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_9bc9d486-16e3-459d-9daa-2b9234be1206" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_c0261bfc-016f-4c88-927c-6510b531937b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_c0261bfc-016f-4c88-927c-6510b531937b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019c006d-65b3-7cc1-8757-a7a3e0c9fcbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LineOfCredit_019c006d-65b3-7cc1-8757-a7a3e0c9fcbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_3f56f422-6d3c-403b-9cd5-258f1a368217" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_3f56f422-6d3c-403b-9cd5-258f1a368217" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_b9ccd924-3375-4db8-8551-5279e1e028f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_b9ccd924-3375-4db8-8551-5279e1e028f6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_7b4c8b9c-d795-46a3-8eac-661c4d26f989" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_7b4c8b9c-d795-46a3-8eac-661c4d26f989" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_3f52a0f2-009f-42f3-ba74-83fe32fa7945" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_3f52a0f2-009f-42f3-ba74-83fe32fa7945" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentFixedChargeCoverageRatio_e01f9961-bcb3-44fe-a1bc-2b882c2cd262" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentFixedChargeCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_avnw_DebtInstrumentFixedChargeCoverageRatio_e01f9961-bcb3-44fe-a1bc-2b882c2cd262" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodOne_d05eedc2-8794-4dac-99d4-417fb20350bf" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentMaximumLeverageRatioPeriodOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodOne_d05eedc2-8794-4dac-99d4-417fb20350bf" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodTwo_ac08446e-3120-445a-a24d-b5b722cf6bc4" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentMaximumLeverageRatioPeriodTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodTwo_ac08446e-3120-445a-a24d-b5b722cf6bc4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentMaximumLeverageRatioTermInQuarters_4bbea475-3fce-41a2-8499-9c2157c659a3" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentMaximumLeverageRatioTermInQuarters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_avnw_DebtInstrumentMaximumLeverageRatioTermInQuarters_4bbea475-3fce-41a2-8499-9c2157c659a3" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodThree_3076b93d-04d3-409c-a8c9-61347a1af919" xlink:href="avnw-20251226.xsd#avnw_DebtInstrumentMaximumLeverageRatioPeriodThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_f8d06c62-4a7a-46b2-9a53-88a6359594ce" xlink:to="loc_avnw_DebtInstrumentMaximumLeverageRatioPeriodThree_3076b93d-04d3-409c-a8c9-61347a1af919" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#CreditFacilityandDebtScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9fb3943f-f683-4635-9aa1-2144a30b2fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_DebtInstrumentTable_9fb3943f-f683-4635-9aa1-2144a30b2fa5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_6fbde2ab-038a-41ca-a904-b6a7fcf13a70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fb3943f-f683-4635-9aa1-2144a30b2fa5" xlink:to="loc_us-gaap_CreditFacilityAxis_6fbde2ab-038a-41ca-a904-b6a7fcf13a70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6fbde2ab-038a-41ca-a904-b6a7fcf13a70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_6fbde2ab-038a-41ca-a904-b6a7fcf13a70" xlink:to="loc_us-gaap_CreditFacilityDomain_6fbde2ab-038a-41ca-a904-b6a7fcf13a70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bc75bd0e-fb90-4f48-96bd-57b1ce8e9c47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_6fbde2ab-038a-41ca-a904-b6a7fcf13a70" xlink:to="loc_us-gaap_CreditFacilityDomain_bc75bd0e-fb90-4f48-96bd-57b1ce8e9c47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_be1a0b1b-7e6c-4d9d-ba6e-9f71227e29e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bc75bd0e-fb90-4f48-96bd-57b1ce8e9c47" xlink:to="loc_us-gaap_LineOfCreditMember_be1a0b1b-7e6c-4d9d-ba6e-9f71227e29e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9fb3943f-f683-4635-9aa1-2144a30b2fa5" xlink:to="loc_us-gaap_DebtInstrumentAxis_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_05ee2de5-d48c-49c8-a702-b8122f5d1810" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_c2929aaf-eca7-4ad9-a7a2-e9f39ba31823" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_05ee2de5-d48c-49c8-a702-b8122f5d1810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_fffbd201-c7ac-4b97-9b80-7530d56b7bdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_05ee2de5-d48c-49c8-a702-b8122f5d1810" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_fffbd201-c7ac-4b97-9b80-7530d56b7bdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TermLoanFacilityMember_02efcc26-ea09-4004-9c98-75a3d46aa86a" xlink:href="avnw-20251226.xsd#avnw_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_05ee2de5-d48c-49c8-a702-b8122f5d1810" xlink:to="loc_avnw_TermLoanFacilityMember_02efcc26-ea09-4004-9c98-75a3d46aa86a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_c11a794d-04f5-4b7f-a66f-78d5a58f1dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_c11a794d-04f5-4b7f-a66f-78d5a58f1dd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_600ba04a-bcbb-4a79-b17c-0947d628fad7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_600ba04a-bcbb-4a79-b17c-0947d628fad7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_f74524de-1084-4a72-abb9-930a3a85c8e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_LongTermDebt_f74524de-1084-4a72-abb9-930a3a85c8e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_d1ccfb0a-f3a3-4d55-8dc6-cda5e1eb1aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_LongTermDebtCurrent_d1ccfb0a-f3a3-4d55-8dc6-cda5e1eb1aa1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_f8a7c52d-ef52-47e5-a62f-14816c0b27f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df082c41-4905-4545-bc34-9026a1fed8c7" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_f8a7c52d-ef52-47e5-a62f-14816c0b27f8" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RestructuringScheduleofRestructuringRelatedActivitiesDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RestructuringScheduleofRestructuringRelatedActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RestructuringScheduleofRestructuringRelatedActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_c322326e-0c56-4198-81e0-c30add52565b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1bd518d7-b5ac-462e-96c8-1297818278e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c322326e-0c56-4198-81e0-c30add52565b" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1bd518d7-b5ac-462e-96c8-1297818278e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_0b3500d6-3eee-40f4-b995-8c0bc9d74d33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_1bd518d7-b5ac-462e-96c8-1297818278e5" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_0b3500d6-3eee-40f4-b995-8c0bc9d74d33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_0b3500d6-3eee-40f4-b995-8c0bc9d74d33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0b3500d6-3eee-40f4-b995-8c0bc9d74d33" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_0b3500d6-3eee-40f4-b995-8c0bc9d74d33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_5d37fba6-c2f7-43b2-a7ec-821fce3ecbdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_0b3500d6-3eee-40f4-b995-8c0bc9d74d33" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_5d37fba6-c2f7-43b2-a7ec-821fce3ecbdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_39c5c749-15fe-4feb-968a-569ecda59572" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5d37fba6-c2f7-43b2-a7ec-821fce3ecbdd" xlink:to="loc_us-gaap_EmployeeSeveranceMember_39c5c749-15fe-4feb-968a-569ecda59572" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_019bf7d1-9ac2-7ff3-9f7b-e4bd64880e4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_5d37fba6-c2f7-43b2-a7ec-821fce3ecbdd" xlink:to="loc_us-gaap_FacilityClosingMember_019bf7d1-9ac2-7ff3-9f7b-e4bd64880e4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_ab6b91d8-e286-4b89-86a6-2bf12882259c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_c322326e-0c56-4198-81e0-c30add52565b" xlink:to="loc_us-gaap_RestructuringReserveRollForward_ab6b91d8-e286-4b89-86a6-2bf12882259c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_7faeefe7-fca3-4884-ab56-6c8e371e6f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ab6b91d8-e286-4b89-86a6-2bf12882259c" xlink:to="loc_us-gaap_RestructuringReserve_7faeefe7-fca3-4884-ab56-6c8e371e6f2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019bf7d1-9ac2-785e-ad0c-8006c478f5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ab6b91d8-e286-4b89-86a6-2bf12882259c" xlink:to="loc_us-gaap_RestructuringCharges_019bf7d1-9ac2-785e-ad0c-8006c478f5b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_2f455378-fc2e-4d44-8e2b-8c0900a37600" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_ab6b91d8-e286-4b89-86a6-2bf12882259c" xlink:to="loc_us-gaap_PaymentsForRestructuring_2f455378-fc2e-4d44-8e2b-8c0900a37600" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_e94185dc-9ba1-429a-bc65-1c19f4838728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/StockholdersEquityNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#StockholdersEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f19e2fd8-bd63-434c-a981-d949835269a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f19e2fd8-bd63-434c-a981-d949835269a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f19e2fd8-bd63-434c-a981-d949835269a3" xlink:to="loc_us-gaap_PlanNameAxis_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf" xlink:to="loc_us-gaap_PlanNameDomain_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_878caa31-b89d-4e4e-8ab2-739aa079723e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_668d1db0-a07f-4e1e-a8df-9eb2e54c4caf" xlink:to="loc_us-gaap_PlanNameDomain_878caa31-b89d-4e4e-8ab2-739aa079723e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_A2018IncentivePlanMember_e3e0dce2-9627-4501-8ab0-636b159fe5fe" xlink:href="avnw-20251226.xsd#avnw_A2018IncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_878caa31-b89d-4e4e-8ab2-739aa079723e" xlink:to="loc_avnw_A2018IncentivePlanMember_e3e0dce2-9627-4501-8ab0-636b159fe5fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f19e2fd8-bd63-434c-a981-d949835269a3" xlink:to="loc_us-gaap_AwardTypeAxis_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fc7c41f2-fd9a-466f-88e9-7dcf8880b4e7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_0b29a35c-7416-4a96-a93f-943d9f8bc63b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:to="loc_us-gaap_EmployeeStockOptionMember_0b29a35c-7416-4a96-a93f-943d9f8bc63b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6fa75e0b-1440-43cf-8429-a4b0504a1576" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6fa75e0b-1440-43cf-8429-a4b0504a1576" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_ec1bdfb2-531b-44dd-a0d5-041534366b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:to="loc_us-gaap_PerformanceSharesMember_ec1bdfb2-531b-44dd-a0d5-041534366b0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_648f91e3-64bf-4af5-a30e-7b7cd20d35bb" xlink:href="avnw-20251226.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_36ae7978-ee07-4b98-ae9e-b5fdac33060b" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_648f91e3-64bf-4af5-a30e-7b7cd20d35bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_566958ee-a324-4b2d-8aed-73662ee090c2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_566958ee-a324-4b2d-8aed-73662ee090c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_7894b2ea-2e18-4e5c-af37-14acecdea080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_7894b2ea-2e18-4e5c-af37-14acecdea080" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_b722b305-0e54-4817-88cf-169a5a8b3c45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_b722b305-0e54-4817-88cf-169a5a8b3c45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfStockIncentivePlans_e54c083d-3fd0-4f86-89ac-7b37892f2c6a" xlink:href="avnw-20251226.xsd#avnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfStockIncentivePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_avnw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfStockIncentivePlans_e54c083d-3fd0-4f86-89ac-7b37892f2c6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_df95a101-513a-49b6-9662-cd53505c7e71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_df95a101-513a-49b6-9662-cd53505c7e71" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_c275d1ba-2dac-4afe-badc-5c3c6d18bc45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_c275d1ba-2dac-4afe-badc-5c3c6d18bc45" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d72cec4c-cc9a-49ad-8065-e7122b21a02d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d72cec4c-cc9a-49ad-8065-e7122b21a02d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_5870100f-9aff-4e2e-be04-c2a1392d5013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_5870100f-9aff-4e2e-be04-c2a1392d5013" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_659313ed-1f81-4210-9cdf-8664530c5bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_659313ed-1f81-4210-9cdf-8664530c5bfe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_4f282678-7f8b-46ad-abf2-03da04fdc086" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c2e98ba9-ca7c-4dd9-832b-38552a589e9c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_4f282678-7f8b-46ad-abf2-03da04fdc086" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#StockholdersEquityScheduleofStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/StockholdersEquityScheduleofStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5522e1b3-a001-475a-8e57-98233554d571" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c8ff5ad5-b32f-46dc-a3cc-ae5f3e83e02c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5522e1b3-a001-475a-8e57-98233554d571" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c8ff5ad5-b32f-46dc-a3cc-ae5f3e83e02c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_8d49e907-7520-49ca-b5d1-17fc436e2672" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c8ff5ad5-b32f-46dc-a3cc-ae5f3e83e02c" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_8d49e907-7520-49ca-b5d1-17fc436e2672" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_8d49e907-7520-49ca-b5d1-17fc436e2672_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8d49e907-7520-49ca-b5d1-17fc436e2672" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_8d49e907-7520-49ca-b5d1-17fc436e2672_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_719635cd-fa11-40b5-82fc-e81d5228b0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8d49e907-7520-49ca-b5d1-17fc436e2672" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_719635cd-fa11-40b5-82fc-e81d5228b0e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_222a2cc4-7282-4423-bff9-d1c63d54dc5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719635cd-fa11-40b5-82fc-e81d5228b0e6" xlink:to="loc_us-gaap_CostOfSalesMember_222a2cc4-7282-4423-bff9-d1c63d54dc5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_83f7ffe7-e2bc-4964-a56d-a60b0061af7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719635cd-fa11-40b5-82fc-e81d5228b0e6" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_83f7ffe7-e2bc-4964-a56d-a60b0061af7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_ffba4369-ee1b-47db-878d-90a9d961f223" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_719635cd-fa11-40b5-82fc-e81d5228b0e6" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_ffba4369-ee1b-47db-878d-90a9d961f223" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e8fb5384-aaa2-4d2a-930d-0f0608a625d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c8ff5ad5-b32f-46dc-a3cc-ae5f3e83e02c" xlink:to="loc_us-gaap_AwardTypeAxis_e8fb5384-aaa2-4d2a-930d-0f0608a625d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e8fb5384-aaa2-4d2a-930d-0f0608a625d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e8fb5384-aaa2-4d2a-930d-0f0608a625d8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e8fb5384-aaa2-4d2a-930d-0f0608a625d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b5f41c-b122-4e9c-9e49-a4be98fcbe72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e8fb5384-aaa2-4d2a-930d-0f0608a625d8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b5f41c-b122-4e9c-9e49-a4be98fcbe72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_16757a1d-6441-4d52-8608-71a5b4824bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b5f41c-b122-4e9c-9e49-a4be98fcbe72" xlink:to="loc_us-gaap_EmployeeStockOptionMember_16757a1d-6441-4d52-8608-71a5b4824bb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_3bce8971-986b-44e1-99a3-cf623a96de93" xlink:href="avnw-20251226.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b8b5f41c-b122-4e9c-9e49-a4be98fcbe72" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_3bce8971-986b-44e1-99a3-cf623a96de93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_29f210cc-77c8-4df6-b8bd-58e9d8766c6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5522e1b3-a001-475a-8e57-98233554d571" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_29f210cc-77c8-4df6-b8bd-58e9d8766c6c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#SegmentandGeographicInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_134364e4-6848-4146-a50c-a0b3a444757c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_0607d3ab-c182-441f-b7d4-f5e347568623" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_134364e4-6848-4146-a50c-a0b3a444757c" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_0607d3ab-c182-441f-b7d4-f5e347568623" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_49c4d981-3cf6-4892-9e52-43137793acfe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_0607d3ab-c182-441f-b7d4-f5e347568623" xlink:to="loc_srt_MajorCustomersAxis_49c4d981-3cf6-4892-9e52-43137793acfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_49c4d981-3cf6-4892-9e52-43137793acfe_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_49c4d981-3cf6-4892-9e52-43137793acfe" xlink:to="loc_srt_NameOfMajorCustomerDomain_49c4d981-3cf6-4892-9e52-43137793acfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_98bf2a20-4a34-43d2-84dc-e1290e9913da" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_49c4d981-3cf6-4892-9e52-43137793acfe" xlink:to="loc_srt_NameOfMajorCustomerDomain_98bf2a20-4a34-43d2-84dc-e1290e9913da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_OneCustomerMember_f2f8bd52-7f4e-4b4b-8026-d6e6d336f414" xlink:href="avnw-20251226.xsd#avnw_OneCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_98bf2a20-4a34-43d2-84dc-e1290e9913da" xlink:to="loc_avnw_OneCustomerMember_f2f8bd52-7f4e-4b4b-8026-d6e6d336f414" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_974b00da-3ec7-4eda-9151-65ec6a58f2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_0607d3ab-c182-441f-b7d4-f5e347568623" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_974b00da-3ec7-4eda-9151-65ec6a58f2aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_974b00da-3ec7-4eda-9151-65ec6a58f2aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_974b00da-3ec7-4eda-9151-65ec6a58f2aa" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_974b00da-3ec7-4eda-9151-65ec6a58f2aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_90d28075-abbd-4160-93b0-3c80f8e28906" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_974b00da-3ec7-4eda-9151-65ec6a58f2aa" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_90d28075-abbd-4160-93b0-3c80f8e28906" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_c8eab052-afbe-4c80-a178-63242a75c41e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_90d28075-abbd-4160-93b0-3c80f8e28906" xlink:to="loc_us-gaap_SalesRevenueNetMember_c8eab052-afbe-4c80-a178-63242a75c41e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b12f94ae-a50d-49e7-993d-d3d0a2f67a01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_0607d3ab-c182-441f-b7d4-f5e347568623" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b12f94ae-a50d-49e7-993d-d3d0a2f67a01" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b12f94ae-a50d-49e7-993d-d3d0a2f67a01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b12f94ae-a50d-49e7-993d-d3d0a2f67a01" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b12f94ae-a50d-49e7-993d-d3d0a2f67a01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_59a9dfab-ce55-46c6-ba54-525ea962caf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b12f94ae-a50d-49e7-993d-d3d0a2f67a01" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_59a9dfab-ce55-46c6-ba54-525ea962caf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_de208dd5-8a70-4d06-aed2-1de71b74fa56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_59a9dfab-ce55-46c6-ba54-525ea962caf3" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_de208dd5-8a70-4d06-aed2-1de71b74fa56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_ff1e643b-261b-43df-9e71-17d7f104b7bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_134364e4-6848-4146-a50c-a0b3a444757c" xlink:to="loc_us-gaap_NumberOfReportableSegments_ff1e643b-261b-43df-9e71-17d7f104b7bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_16e42d7d-6db6-435e-a447-181665ee60b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_134364e4-6848-4146-a50c-a0b3a444757c" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_16e42d7d-6db6-435e-a447-181665ee60b0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuebyRegionDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#SegmentandGeographicInformationScheduleofRevenuebyRegionDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuebyRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b1f051a-34d8-4174-86ec-8e941de82806" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_63cc1a2b-8e3c-42fa-9f88-ca971b355ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b1f051a-34d8-4174-86ec-8e941de82806" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_63cc1a2b-8e3c-42fa-9f88-ca971b355ef7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_63cc1a2b-8e3c-42fa-9f88-ca971b355ef7" xlink:to="loc_srt_StatementGeographicalAxis_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e" xlink:to="loc_srt_SegmentGeographicalDomain_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_7c8c5691-c69a-4d6e-b6b2-70eb3db8036e" xlink:to="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_bc5616af-9dff-4b70-86e3-4e3548b6fa7d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:to="loc_srt_NorthAmericaMember_bc5616af-9dff-4b70-86e3-4e3548b6fa7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_AfricaAndMiddleEastMember_162dbff7-fa73-4b29-a2ae-d598a03843bd" xlink:href="avnw-20251226.xsd#avnw_AfricaAndMiddleEastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:to="loc_avnw_AfricaAndMiddleEastMember_162dbff7-fa73-4b29-a2ae-d598a03843bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EuropeMember_3d7c3f1a-0d14-41d2-a809-c97798d6c822" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:to="loc_srt_EuropeMember_3d7c3f1a-0d14-41d2-a809-c97798d6c822" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_LatinAmericaAndAsiaPacificMember_5e10bab0-ffa2-40a9-a247-a902cbf67b1a" xlink:href="avnw-20251226.xsd#avnw_LatinAmericaAndAsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8bcb8bdc-9a94-4393-a785-f3754b6e1bf9" xlink:to="loc_avnw_LatinAmericaAndAsiaPacificMember_5e10bab0-ffa2-40a9-a247-a902cbf67b1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7df7a5ff-90be-4e6d-b61e-31234c640258" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b1f051a-34d8-4174-86ec-8e941de82806" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7df7a5ff-90be-4e6d-b61e-31234c640258" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuebyCountryDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#SegmentandGeographicInformationScheduleofRevenuebyCountryDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuebyCountryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_30e7c59d-95be-4324-84df-2dcfc587dfe4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_39494ba4-08ac-4b3b-92e1-6e1f36dc7e77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_30e7c59d-95be-4324-84df-2dcfc587dfe4" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_39494ba4-08ac-4b3b-92e1-6e1f36dc7e77" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_0ccd4659-19b6-4d53-9f14-946800af6c11" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_39494ba4-08ac-4b3b-92e1-6e1f36dc7e77" xlink:to="loc_srt_StatementGeographicalAxis_0ccd4659-19b6-4d53-9f14-946800af6c11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_0ccd4659-19b6-4d53-9f14-946800af6c11_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_0ccd4659-19b6-4d53-9f14-946800af6c11" xlink:to="loc_srt_SegmentGeographicalDomain_0ccd4659-19b6-4d53-9f14-946800af6c11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_e80073e1-8d36-41fe-a10a-a6c5713b4b2d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_0ccd4659-19b6-4d53-9f14-946800af6c11" xlink:to="loc_srt_SegmentGeographicalDomain_e80073e1-8d36-41fe-a10a-a6c5713b4b2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_6573ae38-a2f6-4b82-8345-573139dd83e0" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e80073e1-8d36-41fe-a10a-a6c5713b4b2d" xlink:to="loc_country_US_6573ae38-a2f6-4b82-8345-573139dd83e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IN_3dee0b4d-db99-471d-859f-5f1bba7a934c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e80073e1-8d36-41fe-a10a-a6c5713b4b2d" xlink:to="loc_country_IN_3dee0b4d-db99-471d-859f-5f1bba7a934c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c5e9abf8-8017-420d-a2a4-0ed080af4232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_39494ba4-08ac-4b3b-92e1-6e1f36dc7e77" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c5e9abf8-8017-420d-a2a4-0ed080af4232" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c5e9abf8-8017-420d-a2a4-0ed080af4232_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c5e9abf8-8017-420d-a2a4-0ed080af4232" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c5e9abf8-8017-420d-a2a4-0ed080af4232_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aacee9e6-824b-4ce0-9c8b-b4f9e656a958" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c5e9abf8-8017-420d-a2a4-0ed080af4232" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aacee9e6-824b-4ce0-9c8b-b4f9e656a958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_17f9bd4d-9a1e-46b5-9b25-612484b412e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aacee9e6-824b-4ce0-9c8b-b4f9e656a958" xlink:to="loc_us-gaap_SalesRevenueNetMember_17f9bd4d-9a1e-46b5-9b25-612484b412e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_69344dcf-9efd-453a-9214-4869afe7274c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_39494ba4-08ac-4b3b-92e1-6e1f36dc7e77" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_69344dcf-9efd-453a-9214-4869afe7274c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_69344dcf-9efd-453a-9214-4869afe7274c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_69344dcf-9efd-453a-9214-4869afe7274c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_69344dcf-9efd-453a-9214-4869afe7274c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_7e433815-ebe7-49ef-941d-3b0383312737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_69344dcf-9efd-453a-9214-4869afe7274c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_7e433815-ebe7-49ef-941d-3b0383312737" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_7e201adb-20a5-4774-be22-f6c51e065b29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_7e433815-ebe7-49ef-941d-3b0383312737" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_7e201adb-20a5-4774-be22-f6c51e065b29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_cdc59162-4e76-47ac-8602-b34c49f1286f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_30e7c59d-95be-4324-84df-2dcfc587dfe4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_cdc59162-4e76-47ac-8602-b34c49f1286f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_c4206d3e-3bd2-4723-a56e-3b7c601bef30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_30e7c59d-95be-4324-84df-2dcfc587dfe4" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_c4206d3e-3bd2-4723-a56e-3b7c601bef30" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofLongLivedAssetsbyCountryDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#SegmentandGeographicInformationScheduleofLongLivedAssetsbyCountryDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofLongLivedAssetsbyCountryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6a2a5fe3-b5bc-45c3-b13f-9d35a6784e61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_d5b2020d-086e-4d06-938d-73e87b43597d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6a2a5fe3-b5bc-45c3-b13f-9d35a6784e61" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_d5b2020d-086e-4d06-938d-73e87b43597d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_d5b2020d-086e-4d06-938d-73e87b43597d" xlink:to="loc_srt_StatementGeographicalAxis_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54" xlink:to="loc_srt_SegmentGeographicalDomain_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_67c9d1ce-6afd-4a3a-918e-e70a5bd60a54" xlink:to="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_a75aeaaf-5b94-4234-b2ec-035f596e0ad5" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:to="loc_country_US_a75aeaaf-5b94-4234-b2ec-035f596e0ad5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_SI_1b4f8b9a-ddb5-4efb-aaea-4906aad56e3c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_SI"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:to="loc_country_SI_1b4f8b9a-ddb5-4efb-aaea-4906aad56e3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_NZ_20af2890-79ff-46f7-b73b-189809603ce3" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_NZ"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:to="loc_country_NZ_20af2890-79ff-46f7-b73b-189809603ce3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_SG_527ed9c3-4617-40f3-a3ca-8cebf5fa7c49" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_SG"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:to="loc_country_SG_527ed9c3-4617-40f3-a3ca-8cebf5fa7c49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_OtherCountriesMember_469b79a9-d88f-4bf9-8288-7b32772c3bef" xlink:href="avnw-20251226.xsd#avnw_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ade0226e-d852-4193-b4fc-b7c086946354" xlink:to="loc_avnw_OtherCountriesMember_469b79a9-d88f-4bf9-8288-7b32772c3bef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_978a9fab-c742-47e3-b69d-ad6f8b5f7690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_6a2a5fe3-b5bc-45c3-b13f-9d35a6784e61" xlink:to="loc_us-gaap_NoncurrentAssets_978a9fab-c742-47e3-b69d-ad6f8b5f7690" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/AcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6785be3b-f708-41d4-94d1-91d78661847d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6785be3b-f708-41d4-94d1-91d78661847d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a0bd43dc-3dcb-4987-977e-ca376ff98af9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_6785be3b-f708-41d4-94d1-91d78661847d" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a0bd43dc-3dcb-4987-977e-ca376ff98af9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a0bd43dc-3dcb-4987-977e-ca376ff98af9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a0bd43dc-3dcb-4987-977e-ca376ff98af9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a0bd43dc-3dcb-4987-977e-ca376ff98af9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa5ea3c0-ce43-41a9-ac7a-5a0d7b93ebe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a0bd43dc-3dcb-4987-977e-ca376ff98af9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa5ea3c0-ce43-41a9-ac7a-5a0d7b93ebe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_A4RFLimitedMember_f32969d9-4d9f-425e-8578-73c30260a925" xlink:href="avnw-20251226.xsd#avnw_A4RFLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa5ea3c0-ce43-41a9-ac7a-5a0d7b93ebe7" xlink:to="loc_avnw_A4RFLimitedMember_f32969d9-4d9f-425e-8578-73c30260a925" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECCorporationMember_e548063a-eb84-490c-82eb-d831c9d34995" xlink:href="avnw-20251226.xsd#avnw_NECCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aa5ea3c0-ce43-41a9-ac7a-5a0d7b93ebe7" xlink:to="loc_avnw_NECCorporationMember_e548063a-eb84-490c-82eb-d831c9d34995" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_ca1cbbf3-66a9-4b5f-acac-9537cfadddd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_ca1cbbf3-66a9-4b5f-acac-9537cfadddd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_ae2b9629-f856-4186-8cfb-b0934c6a0aab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_ae2b9629-f856-4186-8cfb-b0934c6a0aab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_a32531e7-fd84-45c2-b3bb-27781d635d37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_a32531e7-fd84-45c2-b3bb-27781d635d37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_dbc95042-12ba-44ec-bd69-a69a3bf1f55c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_dbc95042-12ba-44ec-bd69-a69a3bf1f55c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_8362c44e-3fbb-4ab8-b70f-64665c410ead" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease_8362c44e-3fbb-4ab8-b70f-64665c410ead" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPeriodIncreaseDecrease_bf6f6b75-5fb6-4555-a058-106237120fd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_GoodwillPeriodIncreaseDecrease_bf6f6b75-5fb6-4555-a058-106237120fd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_98e8d84c-7820-475d-aa8b-e8698350fb09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_98e8d84c-7820-475d-aa8b-e8698350fb09" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_4a584443-1a60-4d2e-948b-fe70362d5bf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_4a584443-1a60-4d2e-948b-fe70362d5bf0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_20390ab4-72d5-4adc-bd5d-226e2a0bf83f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_20390ab4-72d5-4adc-bd5d-226e2a0bf83f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_4eaa3814-cf30-4ea7-88b7-07ab8f1de015" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_311485bd-d60c-4285-b775-9edf6af60b87" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_4eaa3814-cf30-4ea7-88b7-07ab8f1de015" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/AcquisitionsScheduleofPreliminaryPurchaseConsiderationDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#AcquisitionsScheduleofPreliminaryPurchaseConsiderationDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/AcquisitionsScheduleofPreliminaryPurchaseConsiderationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92ac7536-de9d-4a50-a751-dec1214bf892" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92ac7536-de9d-4a50-a751-dec1214bf892" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_176b09dd-beb7-495c-8874-59f31540b6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92ac7536-de9d-4a50-a751-dec1214bf892" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_176b09dd-beb7-495c-8874-59f31540b6cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_176b09dd-beb7-495c-8874-59f31540b6cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_176b09dd-beb7-495c-8874-59f31540b6cd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_176b09dd-beb7-495c-8874-59f31540b6cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed0a403f-29f3-47a7-bf8f-e5c4599f64f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_176b09dd-beb7-495c-8874-59f31540b6cd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed0a403f-29f3-47a7-bf8f-e5c4599f64f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_A4RFLimitedMember_52744479-ff53-4436-82b7-c7f00378eb15" xlink:href="avnw-20251226.xsd#avnw_A4RFLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ed0a403f-29f3-47a7-bf8f-e5c4599f64f4" xlink:to="loc_avnw_A4RFLimitedMember_52744479-ff53-4436-82b7-c7f00378eb15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2639eade-1f82-437b-9a90-5d0a56636c05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_92ac7536-de9d-4a50-a751-dec1214bf892" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2639eade-1f82-437b-9a90-5d0a56636c05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2639eade-1f82-437b-9a90-5d0a56636c05_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2639eade-1f82-437b-9a90-5d0a56636c05" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2639eade-1f82-437b-9a90-5d0a56636c05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64588d7b-08d7-443e-9a5e-4c8418a1277c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2639eade-1f82-437b-9a90-5d0a56636c05" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64588d7b-08d7-443e-9a5e-4c8418a1277c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_7d9b7620-bfa3-4e85-81e3-0c5e9b372b77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64588d7b-08d7-443e-9a5e-4c8418a1277c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_7d9b7620-bfa3-4e85-81e3-0c5e9b372b77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_5ce165cc-bad0-4ba9-b006-423464b13fe3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64588d7b-08d7-443e-9a5e-4c8418a1277c" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_5ce165cc-bad0-4ba9-b006-423464b13fe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_d4060cd8-5100-4d95-942a-37462fe59f92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64588d7b-08d7-443e-9a5e-4c8418a1277c" xlink:to="loc_us-gaap_TradeNamesMember_d4060cd8-5100-4d95-942a-37462fe59f92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_dec0fe79-ce3e-46bc-9e94-afadd3584e94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_dec0fe79-ce3e-46bc-9e94-afadd3584e94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_5047a77d-2df9-46dd-967c-c5d5af009317" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_5047a77d-2df9-46dd-967c-c5d5af009317" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_01a7254f-804a-4d18-b060-52a3ab8f7d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_01a7254f-804a-4d18-b060-52a3ab8f7d9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_868ded1b-325b-4e5d-a594-8f34c6bf608e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_868ded1b-325b-4e5d-a594-8f34c6bf608e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5b8aab88-3b61-45b9-9c85-4ceefbc5e4a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_5b8aab88-3b61-45b9-9c85-4ceefbc5e4a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_96301e63-f3b4-49de-b1df-8fd5848acc2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_96301e63-f3b4-49de-b1df-8fd5848acc2a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_8a523b4f-0ab7-42cc-a73b-1609e120f4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_8a523b4f-0ab7-42cc-a73b-1609e120f4e7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_687d0770-49ea-48c8-802d-c9f21fd672c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_687d0770-49ea-48c8-802d-c9f21fd672c1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_a8b650cf-e28a-47fb-bd1d-d3abf81fabce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_a8b650cf-e28a-47fb-bd1d-d3abf81fabce" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e0e56932-5321-4cf2-8c44-6ce6909240ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_Goodwill_e0e56932-5321-4cf2-8c44-6ce6909240ae" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_c8a40e12-83f6-4d2f-989a-25c5f13830f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_0147ba59-629e-4411-a33f-864a83a8bfdb" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_c8a40e12-83f6-4d2f-989a-25c5f13830f6" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_d1d9d7d3-19c2-44c0-96d9-71c351f57a49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:to="loc_us-gaap_OtherCommitmentsTable_d1d9d7d3-19c2-44c0-96d9-71c351f57a49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a6b04cce-e958-46c5-89e4-86960ae02c94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d1d9d7d3-19c2-44c0-96d9-71c351f57a49" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a6b04cce-e958-46c5-89e4-86960ae02c94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_a6b04cce-e958-46c5-89e4-86960ae02c94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a6b04cce-e958-46c5-89e4-86960ae02c94" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_a6b04cce-e958-46c5-89e4-86960ae02c94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_d3057998-470e-491c-ba73-f24415e1372e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_a6b04cce-e958-46c5-89e4-86960ae02c94" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_d3057998-470e-491c-ba73-f24415e1372e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_PurchaseObligationsWithSuppliersOfContractManufacturersMember_bef24bd5-8aa6-4c82-bb4c-b4c2142ad520" xlink:href="avnw-20251226.xsd#avnw_PurchaseObligationsWithSuppliersOfContractManufacturersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_d3057998-470e-491c-ba73-f24415e1372e" xlink:to="loc_avnw_PurchaseObligationsWithSuppliersOfContractManufacturersMember_bef24bd5-8aa6-4c82-bb4c-b4c2142ad520" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ContractualObligationsAssociatedWithSoftwareAsServiceAndSoftwareMember_d55d49e3-65cd-47de-9e6f-acfc121fcef7" xlink:href="avnw-20251226.xsd#avnw_ContractualObligationsAssociatedWithSoftwareAsServiceAndSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_d3057998-470e-491c-ba73-f24415e1372e" xlink:to="loc_avnw_ContractualObligationsAssociatedWithSoftwareAsServiceAndSoftwareMember_d55d49e3-65cd-47de-9e6f-acfc121fcef7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d1d9d7d3-19c2-44c0-96d9-71c351f57a49" xlink:to="loc_srt_RangeAxis_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668" xlink:to="loc_srt_RangeMember_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_30fdfd31-3f24-4363-945f-604a125410f4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_12f1b841-e81b-4d56-a3dc-0d3a1a6f0668" xlink:to="loc_srt_RangeMember_30fdfd31-3f24-4363-945f-604a125410f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3091c7c7-89d0-4159-9423-a008ce8ad9fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_30fdfd31-3f24-4363-945f-604a125410f4" xlink:to="loc_srt_MaximumMember_3091c7c7-89d0-4159-9423-a008ce8ad9fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_cfb7c438-d382-47a6-9d0e-c44ecc5fb83e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:to="loc_us-gaap_PurchaseObligation_cfb7c438-d382-47a6-9d0e-c44ecc5fb83e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TermOfFinancialGuarantees_0d7cc340-c189-4e6d-a076-5926299a101c" xlink:href="avnw-20251226.xsd#avnw_TermOfFinancialGuarantees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:to="loc_avnw_TermOfFinancialGuarantees_0d7cc340-c189-4e6d-a076-5926299a101c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_ba3127ee-02d5-47ee-a87c-88c3077862ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:to="loc_us-gaap_OtherCommitment_ba3127ee-02d5-47ee-a87c-88c3077862ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_027a8f4b-6be0-4c9c-8a77-3197470a4418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_a85ed6d8-c718-4bf7-9f36-5ea0e7a944c5" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_027a8f4b-6be0-4c9c-8a77-3197470a4418" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/GoodwillandIntangibleAssetsScheduleofGoodwillImpairmentDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#GoodwillandIntangibleAssetsScheduleofGoodwillImpairmentDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/GoodwillandIntangibleAssetsScheduleofGoodwillImpairmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c1c69bb5-d4b8-4811-848e-ddb9abe9720e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c1c69bb5-d4b8-4811-848e-ddb9abe9720e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c6257d93-490a-4b2d-9cb0-efceb6274d3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c1c69bb5-d4b8-4811-848e-ddb9abe9720e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c6257d93-490a-4b2d-9cb0-efceb6274d3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6257d93-490a-4b2d-9cb0-efceb6274d3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c6257d93-490a-4b2d-9cb0-efceb6274d3d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c6257d93-490a-4b2d-9cb0-efceb6274d3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c6257d93-490a-4b2d-9cb0-efceb6274d3d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_e348a005-84e2-4fbf-86bf-4e9b7dbd30c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_e348a005-84e2-4fbf-86bf-4e9b7dbd30c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_b6839ef8-5a4a-4e1e-beae-f0c3a957e03f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:to="loc_us-gaap_PatentsMember_b6839ef8-5a4a-4e1e-beae-f0c3a957e03f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_b156e18c-598f-4198-821b-af74373aedb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:to="loc_us-gaap_CustomerRelationshipsMember_b156e18c-598f-4198-821b-af74373aedb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_2fbca7b7-84ce-4d2a-8dad-4021ba3010a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_39b59d8f-35dc-4b5e-b986-0cabe0eb4403" xlink:to="loc_us-gaap_TradeNamesMember_2fbca7b7-84ce-4d2a-8dad-4021ba3010a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_4540e249-0440-4324-8932-3dd81f40d9a1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c1c69bb5-d4b8-4811-848e-ddb9abe9720e" xlink:to="loc_srt_RangeAxis_4540e249-0440-4324-8932-3dd81f40d9a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4540e249-0440-4324-8932-3dd81f40d9a1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_4540e249-0440-4324-8932-3dd81f40d9a1" xlink:to="loc_srt_RangeMember_4540e249-0440-4324-8932-3dd81f40d9a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e0c7fd62-cba8-4705-8571-3eba66a4a3f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_4540e249-0440-4324-8932-3dd81f40d9a1" xlink:to="loc_srt_RangeMember_e0c7fd62-cba8-4705-8571-3eba66a4a3f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_64800e22-ba47-4369-b440-63e1ebdcdd59" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e0c7fd62-cba8-4705-8571-3eba66a4a3f6" xlink:to="loc_srt_MinimumMember_64800e22-ba47-4369-b440-63e1ebdcdd59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4063ad23-827d-4304-9e2d-b6bb332c67ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e0c7fd62-cba8-4705-8571-3eba66a4a3f6" xlink:to="loc_srt_MaximumMember_4063ad23-827d-4304-9e2d-b6bb332c67ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_eefca7ae-29ca-42bc-98c8-29976e329675" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_eefca7ae-29ca-42bc-98c8-29976e329675" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f0ebd529-aafc-4ca9-92f4-f66021faf3ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f0ebd529-aafc-4ca9-92f4-f66021faf3ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_93f05e78-3685-4367-8adf-019491957b46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_93f05e78-3685-4367-8adf-019491957b46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_42cea527-8a66-448f-b250-db1f8c6b5077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_3e2316df-13d5-4418-bf89-3f26db0bcbc7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_42cea527-8a66-448f-b250-db1f8c6b5077" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RelatedPartyTransactionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_57ff03d8-44c6-48ef-baa3-d71537647f25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_57ff03d8-44c6-48ef-baa3-d71537647f25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_57ff03d8-44c6-48ef-baa3-d71537647f25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_57ff03d8-44c6-48ef-baa3-d71537647f25" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_57ff03d8-44c6-48ef-baa3-d71537647f25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e527ed86-0a62-422d-805f-e75aece3c849" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_57ff03d8-44c6-48ef-baa3-d71537647f25" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e527ed86-0a62-422d-805f-e75aece3c849" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECCorporationMember_6a68d35d-d0f9-4d71-9cbb-fd7ff80562a4" xlink:href="avnw-20251226.xsd#avnw_NECCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e527ed86-0a62-422d-805f-e75aece3c849" xlink:to="loc_avnw_NECCorporationMember_6a68d35d-d0f9-4d71-9cbb-fd7ff80562a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_cf398b31-0536-4b36-aa3e-1f44fbc50f0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_cf398b31-0536-4b36-aa3e-1f44fbc50f0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_cf398b31-0536-4b36-aa3e-1f44fbc50f0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_cf398b31-0536-4b36-aa3e-1f44fbc50f0d" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_cf398b31-0536-4b36-aa3e-1f44fbc50f0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_c8ea212e-1eea-4805-90b9-69510fc5c3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_cf398b31-0536-4b36-aa3e-1f44fbc50f0d" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_c8ea212e-1eea-4805-90b9-69510fc5c3d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_LockUpMember_287cd727-d6a3-49d6-b25d-15b8d16d5b92" xlink:href="avnw-20251226.xsd#avnw_LockUpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_c8ea212e-1eea-4805-90b9-69510fc5c3d2" xlink:to="loc_avnw_LockUpMember_287cd727-d6a3-49d6-b25d-15b8d16d5b92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_efb1491e-1b9d-4b9a-b5cf-0072855e346f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_efb1491e-1b9d-4b9a-b5cf-0072855e346f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_efb1491e-1b9d-4b9a-b5cf-0072855e346f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_efb1491e-1b9d-4b9a-b5cf-0072855e346f" xlink:to="loc_us-gaap_RelatedPartyDomain_efb1491e-1b9d-4b9a-b5cf-0072855e346f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_6c837497-69ed-4625-90e8-fba34cf0632d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_efb1491e-1b9d-4b9a-b5cf-0072855e346f" xlink:to="loc_us-gaap_RelatedPartyDomain_6c837497-69ed-4625-90e8-fba34cf0632d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_07fdb64b-abc2-4c44-9650-cd9b3fc2423c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_6c837497-69ed-4625-90e8-fba34cf0632d" xlink:to="loc_us-gaap_RelatedPartyMember_07fdb64b-abc2-4c44-9650-cd9b3fc2423c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_12d66b9f-91f7-472d-9ea7-6904a6b4d057" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_12d66b9f-91f7-472d-9ea7-6904a6b4d057" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_12d66b9f-91f7-472d-9ea7-6904a6b4d057_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_12d66b9f-91f7-472d-9ea7-6904a6b4d057" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_12d66b9f-91f7-472d-9ea7-6904a6b4d057_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_58a3ccbc-3e14-4151-86f3-789433332c31" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_12d66b9f-91f7-472d-9ea7-6904a6b4d057" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_58a3ccbc-3e14-4151-86f3-789433332c31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECTransactionMember_d9953c50-2189-4590-8b29-133b7a9e4df9" xlink:href="avnw-20251226.xsd#avnw_NECTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_58a3ccbc-3e14-4151-86f3-789433332c31" xlink:to="loc_avnw_NECTransactionMember_d9953c50-2189-4590-8b29-133b7a9e4df9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_3867eb43-2cf5-4646-9b11-7109d9b317c8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_25a2872e-e757-491a-bf74-e73000b72252" xlink:to="loc_dei_LegalEntityAxis_3867eb43-2cf5-4646-9b11-7109d9b317c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_3867eb43-2cf5-4646-9b11-7109d9b317c8_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_3867eb43-2cf5-4646-9b11-7109d9b317c8" xlink:to="loc_dei_EntityDomain_3867eb43-2cf5-4646-9b11-7109d9b317c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_780966fa-b6da-4442-b91b-fb8b0e60569d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_3867eb43-2cf5-4646-9b11-7109d9b317c8" xlink:to="loc_dei_EntityDomain_780966fa-b6da-4442-b91b-fb8b0e60569d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECCorporationMember_4b1b651c-c270-4ab7-8944-29e04c4bf7dd" xlink:href="avnw-20251226.xsd#avnw_NECCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780966fa-b6da-4442-b91b-fb8b0e60569d" xlink:to="loc_avnw_NECCorporationMember_4b1b651c-c270-4ab7-8944-29e04c4bf7dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_dae907a2-b4f7-4104-a141-ca47084477ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_dae907a2-b4f7-4104-a141-ca47084477ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ShareReleaseMonthlyReleaseOfIssuedShares_c30ee923-3529-4c3b-87b3-b44428518fd6" xlink:href="avnw-20251226.xsd#avnw_ShareReleaseMonthlyReleaseOfIssuedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:to="loc_avnw_ShareReleaseMonthlyReleaseOfIssuedShares_c30ee923-3529-4c3b-87b3-b44428518fd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ShareReleasePeriodAfterClosingDate_98360787-238a-4ff9-b473-9463a68d2d92" xlink:href="avnw-20251226.xsd#avnw_ShareReleasePeriodAfterClosingDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:to="loc_avnw_ShareReleasePeriodAfterClosingDate_98360787-238a-4ff9-b473-9463a68d2d92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_693564f9-9422-444a-b931-6194cd76ff85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_84cfbf74-f102-49cd-8768-c70bf3847026" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_693564f9-9422-444a-b931-6194cd76ff85" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_97f5bd3a-bf25-436e-b1f3-1204e5e89e67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_9883ff0b-4689-491b-99c1-ff9a159fffdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_97f5bd3a-bf25-436e-b1f3-1204e5e89e67" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_9883ff0b-4689-491b-99c1-ff9a159fffdf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8be1329c-2cda-41ac-ba6f-2a230dea7216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_9883ff0b-4689-491b-99c1-ff9a159fffdf" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8be1329c-2cda-41ac-ba6f-2a230dea7216" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8be1329c-2cda-41ac-ba6f-2a230dea7216_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8be1329c-2cda-41ac-ba6f-2a230dea7216" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8be1329c-2cda-41ac-ba6f-2a230dea7216_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_44fe315f-8097-45ac-b3ff-a94178a30b84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8be1329c-2cda-41ac-ba6f-2a230dea7216" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_44fe315f-8097-45ac-b3ff-a94178a30b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECCorporationMember_d88d927d-dcce-4125-a0b4-91c1c7ea4c74" xlink:href="avnw-20251226.xsd#avnw_NECCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_44fe315f-8097-45ac-b3ff-a94178a30b84" xlink:to="loc_avnw_NECCorporationMember_d88d927d-dcce-4125-a0b4-91c1c7ea4c74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_2ded432f-2b53-409b-836f-3c9c9056d77c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_9883ff0b-4689-491b-99c1-ff9a159fffdf" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_2ded432f-2b53-409b-836f-3c9c9056d77c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_2ded432f-2b53-409b-836f-3c9c9056d77c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_2ded432f-2b53-409b-836f-3c9c9056d77c" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_2ded432f-2b53-409b-836f-3c9c9056d77c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_700aa0b1-b133-4d2c-96fc-68588fa193c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_2ded432f-2b53-409b-836f-3c9c9056d77c" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_700aa0b1-b133-4d2c-96fc-68588fa193c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TransitionServicesMember_f4204d1c-46c8-48c9-aac8-07bcd34b5d1a" xlink:href="avnw-20251226.xsd#avnw_TransitionServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_700aa0b1-b133-4d2c-96fc-68588fa193c2" xlink:to="loc_avnw_TransitionServicesMember_f4204d1c-46c8-48c9-aac8-07bcd34b5d1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ResearchAndDevelopmentServicesMember_d9ab3d8b-8920-456a-8d0a-c448c6fbd43a" xlink:href="avnw-20251226.xsd#avnw_ResearchAndDevelopmentServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_700aa0b1-b133-4d2c-96fc-68588fa193c2" xlink:to="loc_avnw_ResearchAndDevelopmentServicesMember_d9ab3d8b-8920-456a-8d0a-c448c6fbd43a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoriesMember_1cad8b72-0233-42c3-851b-ab933dab295f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_700aa0b1-b133-4d2c-96fc-68588fa193c2" xlink:to="loc_us-gaap_InventoriesMember_1cad8b72-0233-42c3-851b-ab933dab295f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_e4603a5d-c582-4697-9507-34e2275acc82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_97f5bd3a-bf25-436e-b1f3-1204e5e89e67" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_e4603a5d-c582-4697-9507-34e2275acc82" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsScheduleofRelatedPartyTransactionsBalanceSheetsDetails" xlink:type="simple" xlink:href="avnw-20251226.xsd#RelatedPartyTransactionsScheduleofRelatedPartyTransactionsBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RelatedPartyTransactionsScheduleofRelatedPartyTransactionsBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_23e594c5-2751-4372-9729-5a3ed9f083d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d81c11fc-1d33-4ed0-860c-f24d8679ebf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_23e594c5-2751-4372-9729-5a3ed9f083d4" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d81c11fc-1d33-4ed0-860c-f24d8679ebf6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d81c11fc-1d33-4ed0-860c-f24d8679ebf6" xlink:to="loc_srt_CounterpartyNameAxis_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_953ec31f-06b3-449c-b8f2-37b85d2b23bb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_f18a0670-e6f5-4f0e-88b4-ddb101ef5fc5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_953ec31f-06b3-449c-b8f2-37b85d2b23bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_NECCorporationMember_60964b48-4c7c-4386-9efe-982f3c60701c" xlink:href="avnw-20251226.xsd#avnw_NECCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_953ec31f-06b3-449c-b8f2-37b85d2b23bb" xlink:to="loc_avnw_NECCorporationMember_60964b48-4c7c-4386-9efe-982f3c60701c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_d81c11fc-1d33-4ed0-860c-f24d8679ebf6" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5" xlink:to="loc_us-gaap_RelatedPartyDomain_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_f5349119-97ce-4cad-9cb1-5dc205de3c69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_9ee3aa9f-0bda-40dd-b292-f9c3a56182f5" xlink:to="loc_us-gaap_RelatedPartyDomain_f5349119-97ce-4cad-9cb1-5dc205de3c69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_562bb19a-9dae-45ab-87f0-3aab0c3f85c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_f5349119-97ce-4cad-9cb1-5dc205de3c69" xlink:to="loc_us-gaap_RelatedPartyMember_562bb19a-9dae-45ab-87f0-3aab0c3f85c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_96e0eccd-f6ef-4cdf-ac53-653d25b4da66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_23e594c5-2751-4372-9729-5a3ed9f083d4" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_96e0eccd-f6ef-4cdf-ac53-653d25b4da66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_5703d320-30f6-4c30-8f03-7636ca8eba6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_23e594c5-2751-4372-9729-5a3ed9f083d4" xlink:to="loc_us-gaap_AccountsPayableCurrent_5703d320-30f6-4c30-8f03-7636ca8eba6a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_GaryCrokeMember_019bf7e9-4f1d-777f-9de6-dfcb34ca4a09" xlink:href="avnw-20251226.xsd#avnw_GaryCrokeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_avnw_GaryCrokeMember_019bf7e9-4f1d-777f-9de6-dfcb34ca4a09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_PeterSmithMember_019bf7e9-ed17-7811-96cf-56c63a0628c5" xlink:href="avnw-20251226.xsd#avnw_PeterSmithMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_avnw_PeterSmithMember_019bf7e9-ed17-7811-96cf-56c63a0628c5" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
