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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:e8ddfb41-c55c-4017-af8e-986819764879,g:55f5cd34-6d09-4b01-8896-f20391f0e45c-->
<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-20210101.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/Cover" xlink:type="extended" id="i2f685a2e9e4c4b728677fd94d3517aa4_Cover"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" id="icf6c3fdd5bb0493c9b8be715e369362a_CondensedConsolidatedBalanceSheets"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" id="i5154b7c3cfca4ee5ad8402e7f1041caa_CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="extended" id="i10aad8b83aa3440c82f537af8ecd9ada_CondensedConsolidatedStatementsofOperations">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_fb189773-3a0f-490e-a894-d61a6814e7a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_RevenuesAbstract_fb189773-3a0f-490e-a894-d61a6814e7a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_0a1b8546-c86f-4423-a8b3-935fa753e35c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_fb189773-3a0f-490e-a894-d61a6814e7a9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_0a1b8546-c86f-4423-a8b3-935fa753e35c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_afa1beee-cb75-48d9-bda2-acbc8590262f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSoldAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_afa1beee-cb75-48d9-bda2-acbc8590262f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_7f96bb40-4f3f-46d2-b362-e7b4796450a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSoldAbstract_afa1beee-cb75-48d9-bda2-acbc8590262f" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_7f96bb40-4f3f-46d2-b362-e7b4796450a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_ca468833-2510-4e25-b6aa-b00de4a6415c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_GrossProfit_ca468833-2510-4e25-b6aa-b00de4a6415c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_e4b403ab-7495-431a-abc4-342813a93a3e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_e4b403ab-7495-431a-abc4-342813a93a3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_b3ccb8bc-ee81-420f-922b-77066fef6999" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_b3ccb8bc-ee81-420f-922b-77066fef6999" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_525e80fb-877e-4630-a5f5-996e21527a5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:to="loc_us-gaap_RestructuringCharges_525e80fb-877e-4630-a5f5-996e21527a5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_5b4df611-db86-4cb2-81a2-780bdfed3e4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_6bc2a17f-2968-4bda-a7b2-0b937a562f3f" xlink:to="loc_us-gaap_OperatingExpenses_5b4df611-db86-4cb2-81a2-780bdfed3e4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_a93c151c-3e82-407d-841d-9924854906c2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_OperatingIncomeLoss_a93c151c-3e82-407d-841d-9924854906c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_9c72c288-9f0d-454d-bf51-153def2b59fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_InvestmentIncomeInterest_9c72c288-9f0d-454d-bf51-153def2b59fc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_d449fc14-b2b6-4606-908b-c63ac1022b66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_InterestExpense_d449fc14-b2b6-4606-908b-c63ac1022b66" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d41174b4-784b-4c4b-8d1f-6e1686e80d1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d41174b4-784b-4c4b-8d1f-6e1686e80d1c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_ef442d3f-d0cc-493a-bd4d-827650107c94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_ef442d3f-d0cc-493a-bd4d-827650107c94" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_fdf5a12d-88e8-49f1-8958-b290235abf00" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_NetIncomeLoss_fdf5a12d-88e8-49f1-8958-b290235abf00" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_3e79e4df-663e-4988-ab30-04907eff8349" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_EarningsPerShareAbstract_3e79e4df-663e-4988-ab30-04907eff8349" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_93c523ab-0cf9-48a5-8095-763ca7f84641" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_3e79e4df-663e-4988-ab30-04907eff8349" xlink:to="loc_us-gaap_EarningsPerShareBasic_93c523ab-0cf9-48a5-8095-763ca7f84641" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_5b40781c-de4a-4b86-bdc2-d346a9e0bc60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_3e79e4df-663e-4988-ab30-04907eff8349" xlink:to="loc_us-gaap_EarningsPerShareDiluted_5b40781c-de4a-4b86-bdc2-d346a9e0bc60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_34996fce-6319-404a-a62c-80b866d81f09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_34996fce-6319-404a-a62c-80b866d81f09" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2cd1cfd5-f42f-4a57-ac66-4b9fe80ea590" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_34996fce-6319-404a-a62c-80b866d81f09" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_2cd1cfd5-f42f-4a57-ac66-4b9fe80ea590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d3537e8e-a22f-42f0-9f31-0b33d8391fe8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_34996fce-6319-404a-a62c-80b866d81f09" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_d3537e8e-a22f-42f0-9f31-0b33d8391fe8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b4e69eaa-9c0f-415c-b6e5-a97c49818f60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4d477785-97be-4523-ba5d-c31681ff6937" xlink:to="loc_us-gaap_StatementTable_b4e69eaa-9c0f-415c-b6e5-a97c49818f60" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_0d404c61-f431-405a-9264-1f3abb3bd0e2" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b4e69eaa-9c0f-415c-b6e5-a97c49818f60" xlink:to="loc_srt_ProductOrServiceAxis_0d404c61-f431-405a-9264-1f3abb3bd0e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0d404c61-f431-405a-9264-1f3abb3bd0e2_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_0d404c61-f431-405a-9264-1f3abb3bd0e2" xlink:to="loc_srt_ProductsAndServicesDomain_0d404c61-f431-405a-9264-1f3abb3bd0e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d6fdc0a3-1336-4c6d-84c3-3cd77e3f5f2a" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_0d404c61-f431-405a-9264-1f3abb3bd0e2" xlink:to="loc_srt_ProductsAndServicesDomain_d6fdc0a3-1336-4c6d-84c3-3cd77e3f5f2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_06826d7e-059b-4ab3-b19a-466467675d89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d6fdc0a3-1336-4c6d-84c3-3cd77e3f5f2a" xlink:to="loc_us-gaap_ProductMember_06826d7e-059b-4ab3-b19a-466467675d89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_cf4393a3-bd7c-4605-aea1-08d27ea765dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d6fdc0a3-1336-4c6d-84c3-3cd77e3f5f2a" xlink:to="loc_us-gaap_ServiceMember_cf4393a3-bd7c-4605-aea1-08d27ea765dc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofComprehensiveLossIncome" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedStatementsofComprehensiveLossIncome"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofComprehensiveLossIncome" xlink:type="extended" id="i5db000af84e546c99edab799ee746933_CondensedConsolidatedStatementsofComprehensiveLossIncome"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended" id="idb03a7cd02fa4fb0b8e800ed5bc1b8e5_CondensedConsolidatedStatementsofCashFlows"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="avnw-20210101.xsd#CondensedConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="extended" id="i513f60044cdd4c8cbc1aa5ae77689f06_CondensedConsolidatedStatementsofEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_da2c3e7e-3abe-4174-b397-e2a9d7b4c8ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_da2c3e7e-3abe-4174-b397-e2a9d7b4c8ad" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_15a3862b-84fe-4821-b879-1537c3b6df62" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_15a3862b-84fe-4821-b879-1537c3b6df62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_bdb7aa3f-aac2-4d58-bad4-74e257fdbdb2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_StockholdersEquity_bdb7aa3f-aac2-4d58-bad4-74e257fdbdb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b70fa5d1-054f-42e9-8a63-46bd389a2505" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_NetIncomeLoss_b70fa5d1-054f-42e9-8a63-46bd389a2505" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24967418-f23d-4bd9-86cd-407f1ad7bcc7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24967418-f23d-4bd9-86cd-407f1ad7bcc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5c2f5336-5a59-4a5e-b482-da48181ca912" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_5c2f5336-5a59-4a5e-b482-da48181ca912" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_ecea791e-d327-4c45-a808-cf3b0042821a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_ecea791e-d327-4c45-a808-cf3b0042821a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2d86bd81-c3f1-4b07-af3d-2edd352d5f2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2d86bd81-c3f1-4b07-af3d-2edd352d5f2e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_3010ef7c-5285-4f19-8771-bad879bd8be9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_3010ef7c-5285-4f19-8771-bad879bd8be9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_d3ab84ac-df04-44d7-99c7-a649af62f64a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_d3ab84ac-df04-44d7-99c7-a649af62f64a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_0868a824-fd97-4e16-8626-6b2e65de6735" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_0868a824-fd97-4e16-8626-6b2e65de6735" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_b1ba516b-bdcc-457e-8b5e-2e2c0132ad49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_c106ff7e-6b7c-4d61-b6d9-140b82bd4abb" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_b1ba516b-bdcc-457e-8b5e-2e2c0132ad49" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_386c04cf-22b3-4559-ae94-768e8a137505" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8230ff56-8482-4972-aaa6-8857034a391c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_15aa0408-aab8-45ee-90c2-bcb27f2db07a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_da2c3e7e-3abe-4174-b397-e2a9d7b4c8ad" xlink:to="loc_us-gaap_StatementTable_15aa0408-aab8-45ee-90c2-bcb27f2db07a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_49cd0736-5d26-4210-931c-d56bd5a7fa16" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_15aa0408-aab8-45ee-90c2-bcb27f2db07a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_49cd0736-5d26-4210-931c-d56bd5a7fa16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_49cd0736-5d26-4210-931c-d56bd5a7fa16_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_49cd0736-5d26-4210-931c-d56bd5a7fa16" xlink:to="loc_us-gaap_EquityComponentDomain_49cd0736-5d26-4210-931c-d56bd5a7fa16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_49cd0736-5d26-4210-931c-d56bd5a7fa16" xlink:to="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_9bcc9fea-6a50-4c8f-ae3e-0658f506125b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:to="loc_us-gaap_CommonStockMember_9bcc9fea-6a50-4c8f-ae3e-0658f506125b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_bb5881ff-1069-4887-818d-f184cafed01d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_bb5881ff-1069-4887-818d-f184cafed01d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4d2c13a2-7308-41dd-9bba-9fddf13af515" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:to="loc_us-gaap_RetainedEarningsMember_4d2c13a2-7308-41dd-9bba-9fddf13af515" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_003b1e71-36e2-4b4c-9b49-cd67ec126424" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5ff12a13-9c1d-44cd-afa3-89993410bdaa" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_003b1e71-36e2-4b4c-9b49-cd67ec126424" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/TheCompanyandBasisofPresentation" xlink:type="simple" xlink:href="avnw-20210101.xsd#TheCompanyandBasisofPresentation"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/TheCompanyandBasisofPresentation" xlink:type="extended" id="i6c0ab094d5274debbda883e5671d23d5_TheCompanyandBasisofPresentation"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/TheCompanyandBasisofPresentationPolicies" xlink:type="simple" xlink:href="avnw-20210101.xsd#TheCompanyandBasisofPresentationPolicies"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/TheCompanyandBasisofPresentationPolicies" xlink:type="extended" id="i929c449fbfbd4170999f569f5227ab2d_TheCompanyandBasisofPresentationPolicies"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponents" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponents"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponents" xlink:type="extended" id="i98be5bb963a242a994ab6409c090e266_BalanceSheetComponents"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsTables" xlink:type="extended" id="i7d6f393145404b10bc942c0e211af8c4_BalanceSheetComponentsTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsCashCashEquivalentsandRestrictedCashDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsCashCashEquivalentsandRestrictedCashDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsCashCashEquivalentsandRestrictedCashDetails" xlink:type="extended" id="id3c78d6195c94db0833f29d99f9a29d9_BalanceSheetComponentsCashCashEquivalentsandRestrictedCashDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsReceivablesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsReceivablesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsReceivablesDetails" xlink:type="extended" id="i8f294ca5aac648068447bf0527150e24_BalanceSheetComponentsReceivablesDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsInventoriesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsInventoriesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsInventoriesDetails" xlink:type="extended" id="i5dd8d8d7b60b46518d1c26c0f36ad0a8_BalanceSheetComponentsInventoriesDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsInventoryAdjustmentsDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsInventoryAdjustmentsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsInventoryAdjustmentsDetails" xlink:type="extended" id="i23ae7e002e7146dbae7dc6da6b174ff6_BalanceSheetComponentsInventoryAdjustmentsDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAssetsHeldforSaleDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsAssetsHeldforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAssetsHeldforSaleDetails" xlink:type="extended" id="i77d5601c7e11454e834a8d18c6f23b1d_BalanceSheetComponentsAssetsHeldforSaleDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsPropertyPlantandEquipmentDetails" xlink:type="extended" id="if86ec8c01a584450a46b396cbc163ede_BalanceSheetComponentsPropertyPlantandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_680a3eba-a861-41c8-93e3-460ef7c31194" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_4abc7e83-b7a9-48fe-a2d3-67ccabb929a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_680a3eba-a861-41c8-93e3-460ef7c31194" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_4abc7e83-b7a9-48fe-a2d3-67ccabb929a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_753af60d-3545-4375-8d86-a7a3db2dee07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_680a3eba-a861-41c8-93e3-460ef7c31194" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_753af60d-3545-4375-8d86-a7a3db2dee07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_8f09bc6b-22d6-4576-97d6-4b69bd6f3ead" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_680a3eba-a861-41c8-93e3-460ef7c31194" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_8f09bc6b-22d6-4576-97d6-4b69bd6f3ead" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ccc363e4-f096-47dd-a350-864ffc8e9fa4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_680a3eba-a861-41c8-93e3-460ef7c31194" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ccc363e4-f096-47dd-a350-864ffc8e9fa4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7d4e5cce-ee10-48f5-b031-cf49567836c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_ccc363e4-f096-47dd-a350-864ffc8e9fa4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7d4e5cce-ee10-48f5-b031-cf49567836c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7d4e5cce-ee10-48f5-b031-cf49567836c5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7d4e5cce-ee10-48f5-b031-cf49567836c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_7d4e5cce-ee10-48f5-b031-cf49567836c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_7d4e5cce-ee10-48f5-b031-cf49567836c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_ca1e3c57-799c-4af4-ba9e-428a2b5ec89f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:to="loc_us-gaap_LandMember_ca1e3c57-799c-4af4-ba9e-428a2b5ec89f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_ed27b2de-0eaa-4cde-aa9a-f0a6c1c9f5c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_ed27b2de-0eaa-4cde-aa9a-f0a6c1c9f5c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_428feb74-f946-4655-bbbe-83776683630a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_428feb74-f946-4655-bbbe-83776683630a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_e9f7693c-a242-4842-b816-bb3c9afa12a1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_e9f7693c-a242-4842-b816-bb3c9afa12a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetUnderConstructionMember_1810a3c8-6ad9-473c-b6fa-48ead356084d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetUnderConstructionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_84265564-f817-4ed5-83bc-5cd616151089" xlink:to="loc_us-gaap_AssetUnderConstructionMember_1810a3c8-6ad9-473c-b6fa-48ead356084d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="extended" id="i6675053446d4423495fcd18cbce668db_BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAccruedWarrantiesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsAccruedWarrantiesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAccruedWarrantiesDetails" xlink:type="extended" id="i409740ad0ab1436e85be7812a4c396b7_BalanceSheetComponentsAccruedWarrantiesDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAdvancePaymentsandUnearnedRevenueDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#BalanceSheetComponentsAdvancePaymentsandUnearnedRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/BalanceSheetComponentsAdvancePaymentsandUnearnedRevenueDetails" xlink:type="extended" id="i56b58cc213d24e2b9aba6729dfaed2ff_BalanceSheetComponentsAdvancePaymentsandUnearnedRevenueDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilities" xlink:type="simple" xlink:href="avnw-20210101.xsd#FairValueMeasurementsofAssetsandLiabilities"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilities" xlink:type="extended" id="i5e17132e8d934e4b9504a30f6f0b8d3d_FairValueMeasurementsofAssetsandLiabilities"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#FairValueMeasurementsofAssetsandLiabilitiesTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesTables" xlink:type="extended" id="i412dc1fcada647ec81085c746453390b_FairValueMeasurementsofAssetsandLiabilitiesTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#FairValueMeasurementsofAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/FairValueMeasurementsofAssetsandLiabilitiesDetails" xlink:type="extended" id="ic610ea313a4d4c938f4539032e451053_FairValueMeasurementsofAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_42f01236-5b9e-417d-9a72-cef4bdc03156" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_81c99c6c-d22e-4877-a9dc-107a13cb470b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_42f01236-5b9e-417d-9a72-cef4bdc03156" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_81c99c6c-d22e-4877-a9dc-107a13cb470b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_38fc1ab9-907c-4f4e-8075-4a826800cc55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_81c99c6c-d22e-4877-a9dc-107a13cb470b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_38fc1ab9-907c-4f4e-8075-4a826800cc55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_fd15a3f2-df08-4f0e-87c3-4131c68e77a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_42f01236-5b9e-417d-9a72-cef4bdc03156" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_fd15a3f2-df08-4f0e-87c3-4131c68e77a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_bdcc4074-4891-43de-b879-d5f70b15b579" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_fd15a3f2-df08-4f0e-87c3-4131c68e77a9" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_bdcc4074-4891-43de-b879-d5f70b15b579" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure_c75d16d6-ffed-45a5-a323-4acde02ccf2a" xlink:href="avnw-20210101.xsd#avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_42f01236-5b9e-417d-9a72-cef4bdc03156" xlink:to="loc_avnw_MoneyMarketNetAssetValuePerShareFairValueDisclosure_c75d16d6-ffed-45a5-a323-4acde02ccf2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_42f01236-5b9e-417d-9a72-cef4bdc03156" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_509b3240-f627-4c32-8903-c00cda07527a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_13ce4d7f-1779-4ca2-8ffc-d9a31bef8569" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_509b3240-f627-4c32-8903-c00cda07527a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_822e75e2-3ffb-4b70-9c3c-195e67521540" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_509b3240-f627-4c32-8903-c00cda07527a" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_822e75e2-3ffb-4b70-9c3c-195e67521540" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_59ff7beb-d542-4f5d-9609-3d6dbcac3116" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_509b3240-f627-4c32-8903-c00cda07527a" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_59ff7beb-d542-4f5d-9609-3d6dbcac3116" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_4b72a724-2056-4ea8-993a-385bf4ab7dfc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_509b3240-f627-4c32-8903-c00cda07527a" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_4b72a724-2056-4ea8-993a-385bf4ab7dfc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244d8840-870c-4641-a227-4029e3bff10d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244d8840-870c-4641-a227-4029e3bff10d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_244d8840-870c-4641-a227-4029e3bff10d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244d8840-870c-4641-a227-4029e3bff10d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_244d8840-870c-4641-a227-4029e3bff10d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_21246034-e0b6-4561-b55c-5a439a9479b0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_244d8840-870c-4641-a227-4029e3bff10d" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_21246034-e0b6-4561-b55c-5a439a9479b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_3704c847-ab7e-45d4-af79-067ae6799afa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_21246034-e0b6-4561-b55c-5a439a9479b0" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_3704c847-ab7e-45d4-af79-067ae6799afa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ddf8e3af-b381-436b-aafe-57e34089e7d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ddf8e3af-b381-436b-aafe-57e34089e7d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ddf8e3af-b381-436b-aafe-57e34089e7d5_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ddf8e3af-b381-436b-aafe-57e34089e7d5" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ddf8e3af-b381-436b-aafe-57e34089e7d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ad73340a-e8f0-49e0-bcf4-ce81ded84557" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_ddf8e3af-b381-436b-aafe-57e34089e7d5" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ad73340a-e8f0-49e0-bcf4-ce81ded84557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_d959b61f-fa6e-4226-8420-deb66e16a782" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ad73340a-e8f0-49e0-bcf4-ce81ded84557" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_d959b61f-fa6e-4226-8420-deb66e16a782" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_10f74e89-7d23-4568-bc8e-bdf79e2f1a48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ad73340a-e8f0-49e0-bcf4-ce81ded84557" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_10f74e89-7d23-4568-bc8e-bdf79e2f1a48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_4e0af216-f89c-4110-9d06-00338f57c18b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_4e0af216-f89c-4110-9d06-00338f57c18b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4e0af216-f89c-4110-9d06-00338f57c18b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_4e0af216-f89c-4110-9d06-00338f57c18b" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4e0af216-f89c-4110-9d06-00338f57c18b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_85c1549e-3cf4-42eb-9d42-b24d85a0d15c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_4e0af216-f89c-4110-9d06-00338f57c18b" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_85c1549e-3cf4-42eb-9d42-b24d85a0d15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_78902f12-2649-4b6b-9b58-7d0ec28bf6ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_85c1549e-3cf4-42eb-9d42-b24d85a0d15c" xlink:to="loc_us-gaap_MoneyMarketFundsMember_78902f12-2649-4b6b-9b58-7d0ec28bf6ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_af0cfdb4-ecb0-4096-87b5-400de1c7c727" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_85c1549e-3cf4-42eb-9d42-b24d85a0d15c" xlink:to="loc_us-gaap_BankTimeDepositsMember_af0cfdb4-ecb0-4096-87b5-400de1c7c727" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8ac263cc-b979-4aa5-991b-871a3034064b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_75c137c3-ea2f-46a7-8848-667680e0a89d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8ac263cc-b979-4aa5-991b-871a3034064b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8ac263cc-b979-4aa5-991b-871a3034064b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8ac263cc-b979-4aa5-991b-871a3034064b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8ac263cc-b979-4aa5-991b-871a3034064b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_12c0b4aa-c05a-4048-8403-412f48e74419" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8ac263cc-b979-4aa5-991b-871a3034064b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_12c0b4aa-c05a-4048-8403-412f48e74419" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_7e1e8cad-1f81-4aaa-9887-b6bd5d2d730f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_12c0b4aa-c05a-4048-8403-412f48e74419" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_7e1e8cad-1f81-4aaa-9887-b6bd5d2d730f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/Leases" xlink:type="simple" xlink:href="avnw-20210101.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/Leases" xlink:type="extended" id="i2bc9a01cda294fdbb2f8b6c4fee02d44_Leases"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/LeasesTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/LeasesTables" xlink:type="extended" id="ic0ad3ef0c9c444bd88d76ad9352a1533_LeasesTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/LeasesNarrativeDetails" xlink:type="extended" id="i48340135f3e542548cef644bf8024728_LeasesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_eaf708fb-0dae-44a3-ab61-e00c822dbabc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_710baf07-e4e9-4fd0-a372-b98f66758ffa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_eaf708fb-0dae-44a3-ab61-e00c822dbabc" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_710baf07-e4e9-4fd0-a372-b98f66758ffa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_44e5cf31-fef7-4547-b34e-9142dcc46643" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_eaf708fb-0dae-44a3-ab61-e00c822dbabc" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_44e5cf31-fef7-4547-b34e-9142dcc46643" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_dde06d0e-2441-4242-8ec3-01303c29fe0e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_44e5cf31-fef7-4547-b34e-9142dcc46643" xlink:to="loc_srt_RangeAxis_dde06d0e-2441-4242-8ec3-01303c29fe0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_dde06d0e-2441-4242-8ec3-01303c29fe0e_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_dde06d0e-2441-4242-8ec3-01303c29fe0e" xlink:to="loc_srt_RangeMember_dde06d0e-2441-4242-8ec3-01303c29fe0e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d9af066a-c035-4304-8c1c-30b4699a07fd" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_dde06d0e-2441-4242-8ec3-01303c29fe0e" xlink:to="loc_srt_RangeMember_d9af066a-c035-4304-8c1c-30b4699a07fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_91797d7d-63b2-4355-8de5-0b0c6414cbc9" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d9af066a-c035-4304-8c1c-30b4699a07fd" xlink:to="loc_srt_MinimumMember_91797d7d-63b2-4355-8de5-0b0c6414cbc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9372952c-90fd-4b1f-81cd-f0cb100676d6" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d9af066a-c035-4304-8c1c-30b4699a07fd" xlink:to="loc_srt_MaximumMember_9372952c-90fd-4b1f-81cd-f0cb100676d6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/LeasesScheduleofLeaseCostsDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#LeasesScheduleofLeaseCostsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/LeasesScheduleofLeaseCostsDetails" xlink:type="extended" id="i2c799148c6124ffe860ae65795e7c7a6_LeasesScheduleofLeaseCostsDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/LeasesRentExpenseTermsDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#LeasesRentExpenseTermsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/LeasesRentExpenseTermsDetails" xlink:type="extended" id="if825fb63ea524430a2fa77ae35ed7195_LeasesRentExpenseTermsDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/LeasesOperatingLeasesFutureMinimumPaymentsDueDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#LeasesOperatingLeasesFutureMinimumPaymentsDueDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/LeasesOperatingLeasesFutureMinimumPaymentsDueDetails" xlink:type="extended" id="i80c801a998014b5f8251825003f8c409_LeasesOperatingLeasesFutureMinimumPaymentsDueDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CreditFacilityandDebt" xlink:type="simple" xlink:href="avnw-20210101.xsd#CreditFacilityandDebt"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CreditFacilityandDebt" xlink:type="extended" id="i5c3e62466ef0488c92550f14380d35f8_CreditFacilityandDebt"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#CreditFacilityandDebtDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CreditFacilityandDebtDetails" xlink:type="extended" id="id39ddf634aec403cb1122a53c5404422_CreditFacilityandDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_eadf68bf-137a-4e36-af10-35845a5ecdfa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_eadf68bf-137a-4e36-af10-35845a5ecdfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_ab01498c-b3a0-4d7d-bec2-d13817fe3382" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_ab01498c-b3a0-4d7d-bec2-d13817fe3382" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_ad9a691f-8b16-4f46-bf0d-b3606cb0e74b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_ad9a691f-8b16-4f46-bf0d-b3606cb0e74b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_dbe0655c-25aa-4e09-9fde-d1c035eaf2a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_dbe0655c-25aa-4e09-9fde-d1c035eaf2a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_44310463-9b31-4de3-bc19-7862970b886d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_44310463-9b31-4de3-bc19-7862970b886d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_8f72c131-150a-4014-bae2-399710f9a7f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_ShortTermBorrowings_8f72c131-150a-4014-bae2-399710f9a7f8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_69dfe698-6ba2-4a7e-88fc-2227506a9abf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_69dfe698-6ba2-4a7e-88fc-2227506a9abf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_53a3dcab-3c2f-434a-851e-684a1e3c4198" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_53a3dcab-3c2f-434a-851e-684a1e3c4198" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_45b5bdcb-bd96-4e08-b033-f2b71e5bf506" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_45b5bdcb-bd96-4e08-b033-f2b71e5bf506" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_DebtInstrumentDebtDefaultBasisSpreadonApplicableInterestRate_a3d10d65-e706-41ff-9a30-25ab1e85f626" xlink:href="avnw-20210101.xsd#avnw_DebtInstrumentDebtDefaultBasisSpreadonApplicableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_avnw_DebtInstrumentDebtDefaultBasisSpreadonApplicableInterestRate_a3d10d65-e706-41ff-9a30-25ab1e85f626" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_288245d0-2131-4d38-aa83-e3361e6befe4" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4" xlink:to="loc_us-gaap_RelatedPartyDomain_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_c81498fd-270b-4e05-8c0e-bdede5afaf6c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_2ff7c8a6-cbcc-487d-9341-a9b4b39dcfc4" xlink:to="loc_us-gaap_RelatedPartyDomain_c81498fd-270b-4e05-8c0e-bdede5afaf6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfCommonParentMember_474a087b-7e38-4d79-8dcb-ff5bfad3eb6e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsidiaryOfCommonParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_c81498fd-270b-4e05-8c0e-bdede5afaf6c" xlink:to="loc_us-gaap_SubsidiaryOfCommonParentMember_474a087b-7e38-4d79-8dcb-ff5bfad3eb6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_53e6cfb4-29d5-4ca1-be66-a183d56b3f28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_us-gaap_DebtInstrumentAxis_53e6cfb4-29d5-4ca1-be66-a183d56b3f28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_53e6cfb4-29d5-4ca1-be66-a183d56b3f28_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_53e6cfb4-29d5-4ca1-be66-a183d56b3f28" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_53e6cfb4-29d5-4ca1-be66-a183d56b3f28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_12352ea7-4d84-45fc-ae88-4edf945e13ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_53e6cfb4-29d5-4ca1-be66-a183d56b3f28" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_12352ea7-4d84-45fc-ae88-4edf945e13ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_SiliconValleyBankMember_7acd8e1c-9272-4b3f-a54f-31f6e9841b60" xlink:href="avnw-20210101.xsd#avnw_SiliconValleyBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_12352ea7-4d84-45fc-ae88-4edf945e13ed" xlink:to="loc_avnw_SiliconValleyBankMember_7acd8e1c-9272-4b3f-a54f-31f6e9841b60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_BankofNewZealandMember_e822dd00-8445-4407-a72d-82cd34de5013" xlink:href="avnw-20210101.xsd#avnw_BankofNewZealandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_12352ea7-4d84-45fc-ae88-4edf945e13ed" xlink:to="loc_avnw_BankofNewZealandMember_e822dd00-8445-4407-a72d-82cd34de5013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_us-gaap_CreditFacilityAxis_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d" xlink:to="loc_us-gaap_CreditFacilityDomain_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_79722d9a-0cd6-4751-9c52-996eb3474843" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1d3e3a6c-ceb4-4fed-8ba3-e560591e691d" xlink:to="loc_us-gaap_CreditFacilityDomain_79722d9a-0cd6-4751-9c52-996eb3474843" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignLineOfCreditMember_6507d3c4-2997-4564-905c-1c6ed859128d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_79722d9a-0cd6-4751-9c52-996eb3474843" xlink:to="loc_us-gaap_ForeignLineOfCreditMember_6507d3c4-2997-4564-905c-1c6ed859128d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_e73a38e1-1748-499c-aa05-f49fad66a2ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_79722d9a-0cd6-4751-9c52-996eb3474843" xlink:to="loc_us-gaap_LineOfCreditMember_e73a38e1-1748-499c-aa05-f49fad66a2ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_415b785f-d998-4b74-9e77-47b5cf8d44fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditMember_e73a38e1-1748-499c-aa05-f49fad66a2ae" xlink:to="loc_us-gaap_LetterOfCreditMember_415b785f-d998-4b74-9e77-47b5cf8d44fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4091af11-d445-4f69-8376-e6eaf184bcb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditMember_e73a38e1-1748-499c-aa05-f49fad66a2ae" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4091af11-d445-4f69-8376-e6eaf184bcb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_cd70ee44-559e-47af-baae-f5ce2d51e6ce" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_srt_RangeAxis_cd70ee44-559e-47af-baae-f5ce2d51e6ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cd70ee44-559e-47af-baae-f5ce2d51e6ce_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_cd70ee44-559e-47af-baae-f5ce2d51e6ce" xlink:to="loc_srt_RangeMember_cd70ee44-559e-47af-baae-f5ce2d51e6ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a90150c4-57d2-4d99-a539-374a749e3b24" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_cd70ee44-559e-47af-baae-f5ce2d51e6ce" xlink:to="loc_srt_RangeMember_a90150c4-57d2-4d99-a539-374a749e3b24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8b53020d-8f84-4c9d-aeba-7d44fb225691" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a90150c4-57d2-4d99-a539-374a749e3b24" xlink:to="loc_srt_MinimumMember_8b53020d-8f84-4c9d-aeba-7d44fb225691" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1af04b70-e9c3-40b9-b958-e266af15c550" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a90150c4-57d2-4d99-a539-374a749e3b24" xlink:to="loc_srt_MaximumMember_1af04b70-e9c3-40b9-b958-e266af15c550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_us-gaap_VariableRateAxis_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d" xlink:to="loc_us-gaap_VariableRateDomain_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_6f722688-f178-4660-8869-90332166130c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2c40f1f6-525a-4e64-8c89-3bd0fb49f01d" xlink:to="loc_us-gaap_VariableRateDomain_6f722688-f178-4660-8869-90332166130c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember_66bd7ed0-e845-457a-9076-484ef912a0cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrimeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_6f722688-f178-4660-8869-90332166130c" xlink:to="loc_us-gaap_PrimeRateMember_66bd7ed0-e845-457a-9076-484ef912a0cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_5667127c-9a41-404d-9e11-f8d1b7f0ab9b" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7d9c132a-6f54-43d1-a92f-374309292aa3" xlink:to="loc_srt_StatementGeographicalAxis_5667127c-9a41-404d-9e11-f8d1b7f0ab9b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5667127c-9a41-404d-9e11-f8d1b7f0ab9b_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_5667127c-9a41-404d-9e11-f8d1b7f0ab9b" xlink:to="loc_srt_SegmentGeographicalDomain_5667127c-9a41-404d-9e11-f8d1b7f0ab9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f92b5727-61ed-4e1c-874e-04eaf61d10c1" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_5667127c-9a41-404d-9e11-f8d1b7f0ab9b" xlink:to="loc_srt_SegmentGeographicalDomain_f92b5727-61ed-4e1c-874e-04eaf61d10c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_NZ_ddd90dff-7800-427c-b80e-81f5d3136b8a" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_NZ"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_f92b5727-61ed-4e1c-874e-04eaf61d10c1" xlink:to="loc_country_NZ_ddd90dff-7800-427c-b80e-81f5d3136b8a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognition" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognition"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognition" xlink:type="extended" id="i16419773d0984bfeb777f9d97ca27e27_RevenueRecognition"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognitionTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionTables" xlink:type="extended" id="idb5028ccd9fd4427954e0ad426090fa0_RevenueRecognitionTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionContractedBalancesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognitionContractedBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionContractedBalancesDetails" xlink:type="extended" id="if5850b0a6b194fe0a21a101895e885e0_RevenueRecognitionContractedBalancesDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" id="ie2643cc732f9428589cbd68c07748e57_RevenueRecognitionNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_90f790fc-e027-429d-a020-281f939e6434" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:to="loc_us-gaap_ContractWithCustomerLiability_90f790fc-e027-429d-a020-281f939e6434" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ContractWithCustomerLiabilityCurrentPercent_2dac6209-0a95-46c7-98f7-348d9afcf26d" xlink:href="avnw-20210101.xsd#avnw_ContractWithCustomerLiabilityCurrentPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:to="loc_avnw_ContractWithCustomerLiabilityCurrentPercent_2dac6209-0a95-46c7-98f7-348d9afcf26d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8c4f56ab-6971-487f-9eba-a813ee3b205b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_8c4f56ab-6971-487f-9eba-a813ee3b205b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_bd073925-a414-49b2-a719-27d52323cf56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_bd073925-a414-49b2-a719-27d52323cf56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_bf349509-aac9-4c2b-a2b8-6b5ebbef1aef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_65896cf1-1833-41aa-a8dd-7b0452461390" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_bf349509-aac9-4c2b-a2b8-6b5ebbef1aef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_a61cc89b-028a-4152-8d94-7e47eb47d571" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_bf349509-aac9-4c2b-a2b8-6b5ebbef1aef" xlink:to="loc_srt_ProductOrServiceAxis_a61cc89b-028a-4152-8d94-7e47eb47d571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a61cc89b-028a-4152-8d94-7e47eb47d571_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_a61cc89b-028a-4152-8d94-7e47eb47d571" xlink:to="loc_srt_ProductsAndServicesDomain_a61cc89b-028a-4152-8d94-7e47eb47d571_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_635a3a38-d368-409e-ba1b-7b9f73fee51e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_a61cc89b-028a-4152-8d94-7e47eb47d571" xlink:to="loc_srt_ProductsAndServicesDomain_635a3a38-d368-409e-ba1b-7b9f73fee51e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_185329b8-59fa-4ea1-a910-ae7bc1cf5f24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_635a3a38-d368-409e-ba1b-7b9f73fee51e" xlink:to="loc_us-gaap_ServiceMember_185329b8-59fa-4ea1-a910-ae7bc1cf5f24" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="extended" id="ie6323518637141fc92b4eae3f82cf0fa_RevenueRecognitionRemainingPerformanceObligationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_c1ce1197-2938-4746-b571-762d8cecb9b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_c1ce1197-2938-4746-b571-762d8cecb9b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_57d85ebe-3d80-49c2-ba12-9c3f861ab4c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_57d85ebe-3d80-49c2-ba12-9c3f861ab4c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_aab23b3a-fafa-48ac-abb6-da7d9f1cf3bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_aab23b3a-fafa-48ac-abb6-da7d9f1cf3bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation_0379dc44-75a0-47f1-be97-5cea4e0035f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation_0379dc44-75a0-47f1-be97-5cea4e0035f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_43329099-6d88-483d-a80d-b7fb6e7e5970" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_43329099-6d88-483d-a80d-b7fb6e7e5970" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_9a5a72fc-fe9b-43ea-824b-f1d4c7fef91f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_43329099-6d88-483d-a80d-b7fb6e7e5970" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_9a5a72fc-fe9b-43ea-824b-f1d4c7fef91f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="avnw-20210101.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1" xlink:type="extended" id="i7a0a1711a50d4e7d89287bb8935b7aaf_RevenueRecognitionRemainingPerformanceObligationsDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_c1ce1197-2938-4746-b571-762d8cecb9b5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_c1ce1197-2938-4746-b571-762d8cecb9b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_57d85ebe-3d80-49c2-ba12-9c3f861ab4c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_57d85ebe-3d80-49c2-ba12-9c3f861ab4c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_aab23b3a-fafa-48ac-abb6-da7d9f1cf3bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_aab23b3a-fafa-48ac-abb6-da7d9f1cf3bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation_0379dc44-75a0-47f1-be97-5cea4e0035f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionExplanation_0379dc44-75a0-47f1-be97-5cea4e0035f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_43329099-6d88-483d-a80d-b7fb6e7e5970" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_a90847e0-9199-46cc-a7e7-c30fbc20efa3" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_43329099-6d88-483d-a80d-b7fb6e7e5970" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformation" xlink:type="simple" xlink:href="avnw-20210101.xsd#SegmentandGeographicInformation"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformation" xlink:type="extended" id="ibda0df0e99314571901bcef01c370fce_SegmentandGeographicInformation"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#SegmentandGeographicInformationTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationTables" xlink:type="extended" id="i9a8b45d299dc402d8bab63a03a033ce7_SegmentandGeographicInformationTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuesbyGeographicRegionDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#SegmentandGeographicInformationScheduleofRevenuesbyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/SegmentandGeographicInformationScheduleofRevenuesbyGeographicRegionDetails" xlink:type="extended" id="i6ec5045a3c034cf3a13c2a3577346766_SegmentandGeographicInformationScheduleofRevenuesbyGeographicRegionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b95be2c-86cc-41ed-a26e-cb0e6b8bb974" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_90d932a2-1255-4a15-828f-d01b8f3e3bdd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b95be2c-86cc-41ed-a26e-cb0e6b8bb974" xlink:to="loc_us-gaap_NumberOfReportableSegments_90d932a2-1255-4a15-828f-d01b8f3e3bdd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7823d365-95b1-4f5b-8846-7e8c6cf07a54" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b95be2c-86cc-41ed-a26e-cb0e6b8bb974" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_7823d365-95b1-4f5b-8846-7e8c6cf07a54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_d2db0bc6-2dfc-4b96-828c-dc2ebead980d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b95be2c-86cc-41ed-a26e-cb0e6b8bb974" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_d2db0bc6-2dfc-4b96-828c-dc2ebead980d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_5b95be2c-86cc-41ed-a26e-cb0e6b8bb974" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_26dddd08-80d5-4e83-9bdc-129cf5ff84d5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:to="loc_srt_StatementGeographicalAxis_26dddd08-80d5-4e83-9bdc-129cf5ff84d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_26dddd08-80d5-4e83-9bdc-129cf5ff84d5_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_26dddd08-80d5-4e83-9bdc-129cf5ff84d5" xlink:to="loc_srt_SegmentGeographicalDomain_26dddd08-80d5-4e83-9bdc-129cf5ff84d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_26dddd08-80d5-4e83-9bdc-129cf5ff84d5" xlink:to="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_b6fdc68d-6961-4e2a-abbb-e07890cc7185" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:to="loc_srt_NorthAmericaMember_b6fdc68d-6961-4e2a-abbb-e07890cc7185" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_AfricaAndMiddleEastMember_36cb5c9a-c39e-41de-af42-e089cb49290f" xlink:href="avnw-20210101.xsd#avnw_AfricaAndMiddleEastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:to="loc_avnw_AfricaAndMiddleEastMember_36cb5c9a-c39e-41de-af42-e089cb49290f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_EuropeAndRussiaMember_fee8b817-aab1-49dd-952f-85759377815c" xlink:href="avnw-20210101.xsd#avnw_EuropeAndRussiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:to="loc_avnw_EuropeAndRussiaMember_fee8b817-aab1-49dd-952f-85759377815c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_LatinAmericaAndAsiaPacificMember_3ed1d52e-66e7-4871-b672-e773d5fbb50e" xlink:href="avnw-20210101.xsd#avnw_LatinAmericaAndAsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_71450dc2-fafe-460f-95b8-741dc2b58481" xlink:to="loc_avnw_LatinAmericaAndAsiaPacificMember_3ed1d52e-66e7-4871-b672-e773d5fbb50e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_816d8614-f270-4c28-a9e5-42e85a91158e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_816d8614-f270-4c28-a9e5-42e85a91158e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_816d8614-f270-4c28-a9e5-42e85a91158e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_816d8614-f270-4c28-a9e5-42e85a91158e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_816d8614-f270-4c28-a9e5-42e85a91158e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aa63a722-597c-4a6b-b532-6df86f3d95cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_816d8614-f270-4c28-a9e5-42e85a91158e" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aa63a722-597c-4a6b-b532-6df86f3d95cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_9442d55b-eda1-496c-98b0-b87eb7859b07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aa63a722-597c-4a6b-b532-6df86f3d95cb" xlink:to="loc_us-gaap_SalesRevenueNetMember_9442d55b-eda1-496c-98b0-b87eb7859b07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_2fc5ad0b-1a4a-43d8-8de0-9f18368500a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_aa63a722-597c-4a6b-b532-6df86f3d95cb" xlink:to="loc_us-gaap_AccountsReceivableMember_2fc5ad0b-1a4a-43d8-8de0-9f18368500a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_854d92d7-2ac3-4793-9a77-5728a2ca3d90" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_2fce4276-e9f1-4cab-b10f-2c491bf1dc6e" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_854d92d7-2ac3-4793-9a77-5728a2ca3d90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_e7e52286-b007-4557-b88c-44c74215f8e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_854d92d7-2ac3-4793-9a77-5728a2ca3d90" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_e7e52286-b007-4557-b88c-44c74215f8e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_75a4113e-6a53-4930-96b1-d992ba9b78a7" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_412b13e7-d77f-4600-9fe1-d8ad5d3fee6b" xlink:to="loc_srt_MajorCustomersAxis_75a4113e-6a53-4930-96b1-d992ba9b78a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_75a4113e-6a53-4930-96b1-d992ba9b78a7_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_75a4113e-6a53-4930-96b1-d992ba9b78a7" xlink:to="loc_srt_NameOfMajorCustomerDomain_75a4113e-6a53-4930-96b1-d992ba9b78a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_86301f1d-f289-4ac5-ae44-b45571af3809" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_75a4113e-6a53-4930-96b1-d992ba9b78a7" xlink:to="loc_srt_NameOfMajorCustomerDomain_86301f1d-f289-4ac5-ae44-b45571af3809" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_AUSStateGovernmentCustomerMember_4e0d3110-8bea-4591-baf4-ee3c2c8625cf" xlink:href="avnw-20210101.xsd#avnw_AUSStateGovernmentCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_86301f1d-f289-4ac5-ae44-b45571af3809" xlink:to="loc_avnw_AUSStateGovernmentCustomerMember_4e0d3110-8bea-4591-baf4-ee3c2c8625cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_MotorolaSolutionsIncMember_6037aac6-7bd5-444f-95f9-06ac73733961" xlink:href="avnw-20210101.xsd#avnw_MotorolaSolutionsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_86301f1d-f289-4ac5-ae44-b45571af3809" xlink:to="loc_avnw_MotorolaSolutionsIncMember_6037aac6-7bd5-444f-95f9-06ac73733961" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_MobileTelephoneNetworksMember_f1575aa5-ae45-4176-859e-88fd8d6f84bb" xlink:href="avnw-20210101.xsd#avnw_MobileTelephoneNetworksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_86301f1d-f289-4ac5-ae44-b45571af3809" xlink:to="loc_avnw_MobileTelephoneNetworksMember_f1575aa5-ae45-4176-859e-88fd8d6f84bb" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/Equity" xlink:type="simple" xlink:href="avnw-20210101.xsd#Equity"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/Equity" xlink:type="extended" id="i5a5712bf7cc948f3a4db02d9d59351ac_Equity"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/EquityTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#EquityTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/EquityTables" xlink:type="extended" id="ica0bdc1c225042a6823a64d035dcd477_EquityTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/EquityNarrativeDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#EquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/EquityNarrativeDetails" xlink:type="extended" id="i466426ec10864bdaa94d929d64f3381f_EquityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_284fd12d-c861-4d49-be85-f7520ddd843b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_284fd12d-c861-4d49-be85-f7520ddd843b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_8678c549-d788-432a-9632-ba1792ac4c49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_8678c549-d788-432a-9632-ba1792ac4c49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofStockIncentivePlans_5c7d156e-7db2-4f36-aa1d-d6e4b7f6f03f" xlink:href="avnw-20210101.xsd#avnw_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofStockIncentivePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_avnw_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofStockIncentivePlans_5c7d156e-7db2-4f36-aa1d-d6e4b7f6f03f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_74d3e9cf-8bf2-4043-8741-8b1b44aea4c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_74d3e9cf-8bf2-4043-8741-8b1b44aea4c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_c1eff2ed-2fa6-472e-b33d-2c97a3290581" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_c1eff2ed-2fa6-472e-b33d-2c97a3290581" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_675dc969-ee17-44ba-a85d-a9b734edfff0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_675dc969-ee17-44ba-a85d-a9b734edfff0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c5ae98f3-a103-4e0a-ac87-00dd16cd4bb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_c5ae98f3-a103-4e0a-ac87-00dd16cd4bb6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_afe7be11-1ebf-4ec1-8de1-04ebdb094ff4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_afe7be11-1ebf-4ec1-8de1-04ebdb094ff4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_41fd5344-54a6-49fd-b6ec-7c75230945d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_41fd5344-54a6-49fd-b6ec-7c75230945d3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0a16cb84-c6cf-41e6-8eaa-f691a2f514d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0a16cb84-c6cf-41e6-8eaa-f691a2f514d9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ClassofWarrantorRightNumberofRightsAsDividendDeclaredForEachShareofCommonStock_628fe7f6-2a8b-4e83-8fe4-e7cab20ede2a" xlink:href="avnw-20210101.xsd#avnw_ClassofWarrantorRightNumberofRightsAsDividendDeclaredForEachShareofCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_avnw_ClassofWarrantorRightNumberofRightsAsDividendDeclaredForEachShareofCommonStock_628fe7f6-2a8b-4e83-8fe4-e7cab20ede2a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_cd23c37a-7345-4549-8641-27aaa38090d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_cd23c37a-7345-4549-8641-27aaa38090d8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_2c75d9bb-8dfc-4c72-b4db-c6bc774c37c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_2c75d9bb-8dfc-4c72-b4db-c6bc774c37c8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_77a51c75-5bba-4075-9b4a-273ad56d59d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_77a51c75-5bba-4075-9b4a-273ad56d59d2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_770a744d-52c7-448f-aebf-2d99d74239bc" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_34159e47-6385-4c1b-be97-088565790017" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_34159e47-6385-4c1b-be97-088565790017" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_34159e47-6385-4c1b-be97-088565790017_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_34159e47-6385-4c1b-be97-088565790017" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_34159e47-6385-4c1b-be97-088565790017_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_af51a045-47d0-413c-9ab2-932af636e09f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_34159e47-6385-4c1b-be97-088565790017" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_af51a045-47d0-413c-9ab2-932af636e09f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_ShareRepurchaseProgramMember_3ba8814b-05c3-4cb9-8768-60028c4e145c" xlink:href="avnw-20210101.xsd#avnw_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_af51a045-47d0-413c-9ab2-932af636e09f" xlink:to="loc_avnw_ShareRepurchaseProgramMember_3ba8814b-05c3-4cb9-8768-60028c4e145c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:to="loc_us-gaap_PlanNameAxis_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae" xlink:to="loc_us-gaap_PlanNameDomain_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_6f743035-fb3f-4f6e-a9e9-c3c9652765b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_ed93066b-8d0d-4a7d-bfcc-ebd9565d24ae" xlink:to="loc_us-gaap_PlanNameDomain_6f743035-fb3f-4f6e-a9e9-c3c9652765b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_A2018StockPlanMember_760e478e-1dc3-4e04-9140-7937d25690cc" xlink:href="avnw-20210101.xsd#avnw_A2018StockPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_6f743035-fb3f-4f6e-a9e9-c3c9652765b9" xlink:to="loc_avnw_A2018StockPlanMember_760e478e-1dc3-4e04-9140-7937d25690cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b1732fc8-c170-4a77-b132-fc4ed07c8c0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:to="loc_us-gaap_AwardTypeAxis_b1732fc8-c170-4a77-b132-fc4ed07c8c0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1732fc8-c170-4a77-b132-fc4ed07c8c0c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b1732fc8-c170-4a77-b132-fc4ed07c8c0c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b1732fc8-c170-4a77-b132-fc4ed07c8c0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b1732fc8-c170-4a77-b132-fc4ed07c8c0c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_045bace1-16b3-470f-83e5-e9fccadecc89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:to="loc_us-gaap_EmployeeStockOptionMember_045bace1-16b3-470f-83e5-e9fccadecc89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_7a9048df-73bf-442b-abe5-2a759e3ca558" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_7a9048df-73bf-442b-abe5-2a759e3ca558" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_PerformanceRestrictedStockUnitsMember_874b9163-75b3-482d-9c7f-84c39d298c4e" xlink:href="avnw-20210101.xsd#avnw_PerformanceRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:to="loc_avnw_PerformanceRestrictedStockUnitsMember_874b9163-75b3-482d-9c7f-84c39d298c4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_ae189d80-fc19-49c8-9a5f-1729f0ec8758" xlink:href="avnw-20210101.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9d3efe1f-aa88-4dc1-91a1-e7632b0a4868" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_ae189d80-fc19-49c8-9a5f-1729f0ec8758" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_cec29700-f51e-4964-80e1-26e451c16f81" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d774b780-72b3-41fe-a632-863de4837724" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_cec29700-f51e-4964-80e1-26e451c16f81" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_cec29700-f51e-4964-80e1-26e451c16f81_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_cec29700-f51e-4964-80e1-26e451c16f81" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_cec29700-f51e-4964-80e1-26e451c16f81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_365e00ee-e747-43fd-b3d0-88ac180e1b3a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_cec29700-f51e-4964-80e1-26e451c16f81" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_365e00ee-e747-43fd-b3d0-88ac180e1b3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsSubjectToMandatoryRedemptionMember_722edfac-19d1-4486-b41d-0081f97ee25f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WarrantsAndRightsSubjectToMandatoryRedemptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_365e00ee-e747-43fd-b3d0-88ac180e1b3a" xlink:to="loc_us-gaap_WarrantsAndRightsSubjectToMandatoryRedemptionMember_722edfac-19d1-4486-b41d-0081f97ee25f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/EquityStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#EquityStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/EquityStockBasedCompensationExpenseDetails" xlink:type="extended" id="i439d9908be954aff8915e3b1af753b5f_EquityStockBasedCompensationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89770daf-607e-424e-9e91-14fdbb44751d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_1cac579c-67e9-4c8a-a9ac-46bc79efa4d1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89770daf-607e-424e-9e91-14fdbb44751d" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_1cac579c-67e9-4c8a-a9ac-46bc79efa4d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_809ec437-126b-402d-93c5-be978105cb42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89770daf-607e-424e-9e91-14fdbb44751d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_809ec437-126b-402d-93c5-be978105cb42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_809ec437-126b-402d-93c5-be978105cb42" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5ca514c9-ffa0-4f9c-b979-5901f9d6dd91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_e956214b-0c7f-4ae2-8ac7-2bc4d73b50bd" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5ca514c9-ffa0-4f9c-b979-5901f9d6dd91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_65220517-5c95-4aea-8267-9bb81c2cbb75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5ca514c9-ffa0-4f9c-b979-5901f9d6dd91" xlink:to="loc_us-gaap_CostOfSalesMember_65220517-5c95-4aea-8267-9bb81c2cbb75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_a5cb5fe3-8e6d-432e-b653-63a45f4a3cf9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5ca514c9-ffa0-4f9c-b979-5901f9d6dd91" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_a5cb5fe3-8e6d-432e-b653-63a45f4a3cf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_e8cf8bac-46d1-4e0f-a574-2c3b505403f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5ca514c9-ffa0-4f9c-b979-5901f9d6dd91" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_e8cf8bac-46d1-4e0f-a574-2c3b505403f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_809ec437-126b-402d-93c5-be978105cb42" xlink:to="loc_us-gaap_AwardTypeAxis_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_75922487-fa05-4c57-b1fa-e22438a44854" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fcaa9d8a-eb0d-47cb-887e-7b477ee98dc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_75922487-fa05-4c57-b1fa-e22438a44854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e6de0994-34b8-4f7c-91c8-de691403eae4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_75922487-fa05-4c57-b1fa-e22438a44854" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e6de0994-34b8-4f7c-91c8-de691403eae4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_605314c8-5756-4b36-941c-0b4321efe799" xlink:href="avnw-20210101.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_75922487-fa05-4c57-b1fa-e22438a44854" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_605314c8-5756-4b36-941c-0b4321efe799" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RestructuringActivities" xlink:type="simple" xlink:href="avnw-20210101.xsd#RestructuringActivities"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RestructuringActivities" xlink:type="extended" id="i663f938fd54e4112a7d206723a2e1b29_RestructuringActivities"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RestructuringActivitiesTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#RestructuringActivitiesTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RestructuringActivitiesTables" xlink:type="extended" id="i67e495c5c1e347239c67c87ff748ce62_RestructuringActivitiesTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/RestructuringActivitiesRestructuringRelatedActivitiesDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#RestructuringActivitiesRestructuringRelatedActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/RestructuringActivitiesRestructuringRelatedActivitiesDetails" xlink:type="extended" id="i0daacd285ed642cea6e533c285b89981_RestructuringActivitiesRestructuringRelatedActivitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_69c91ee0-43a4-4586-a00b-46aaae42d7b6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_74ca4e70-9497-4445-bb7b-02ec6801582d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_69c91ee0-43a4-4586-a00b-46aaae42d7b6" xlink:to="loc_us-gaap_RestructuringReserveRollForward_74ca4e70-9497-4445-bb7b-02ec6801582d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_4f55a7d7-fba5-4902-871a-d6928c23fe64" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_74ca4e70-9497-4445-bb7b-02ec6801582d" xlink:to="loc_us-gaap_RestructuringReserve_4f55a7d7-fba5-4902-871a-d6928c23fe64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_97548d90-22e9-4412-b0f1-caf389252ff3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_74ca4e70-9497-4445-bb7b-02ec6801582d" xlink:to="loc_us-gaap_PaymentsForRestructuring_97548d90-22e9-4412-b0f1-caf389252ff3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_75e18f78-f860-41e0-b27a-211411aa122d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_74ca4e70-9497-4445-bb7b-02ec6801582d" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_75e18f78-f860-41e0-b27a-211411aa122d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_f303bcdc-8416-4d14-a9e2-117cb4eae83d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_95c01a79-2dcd-4fb5-b9a8-395557634245" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_69c91ee0-43a4-4586-a00b-46aaae42d7b6" xlink:to="loc_us-gaap_RestructuringReserveCurrent_95c01a79-2dcd-4fb5-b9a8-395557634245" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveSettledWithoutCash2_23fd4f1d-412a-4ef0-b5d2-d4db040611ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserveSettledWithoutCash2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_69c91ee0-43a4-4586-a00b-46aaae42d7b6" xlink:to="loc_us-gaap_RestructuringReserveSettledWithoutCash2_23fd4f1d-412a-4ef0-b5d2-d4db040611ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e3258536-8adc-4c3f-bdb7-8520505dfd0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_69c91ee0-43a4-4586-a00b-46aaae42d7b6" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e3258536-8adc-4c3f-bdb7-8520505dfd0d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_364bb45a-8d21-4078-aceb-32c98328d6c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e3258536-8adc-4c3f-bdb7-8520505dfd0d" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_364bb45a-8d21-4078-aceb-32c98328d6c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_364bb45a-8d21-4078-aceb-32c98328d6c4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_364bb45a-8d21-4078-aceb-32c98328d6c4" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_364bb45a-8d21-4078-aceb-32c98328d6c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_34613879-962c-4911-88e8-ea575d530ecf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_364bb45a-8d21-4078-aceb-32c98328d6c4" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_34613879-962c-4911-88e8-ea575d530ecf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_24d97f29-47eb-4fe7-a5a1-f2258d12895f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_34613879-962c-4911-88e8-ea575d530ecf" xlink:to="loc_us-gaap_EmployeeSeveranceMember_24d97f29-47eb-4fe7-a5a1-f2258d12895f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FacilityClosingMember_330605e1-1782-4ddf-a9b4-ac7da4aa01ac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FacilityClosingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_34613879-962c-4911-88e8-ea575d530ecf" xlink:to="loc_us-gaap_FacilityClosingMember_330605e1-1782-4ddf-a9b4-ac7da4aa01ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_e3258536-8adc-4c3f-bdb7-8520505dfd0d" xlink:to="loc_us-gaap_RestructuringPlanAxis_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a" xlink:to="loc_us-gaap_RestructuringPlanDomain_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_c7d88742-5c11-4a88-a81b-1eaee7bb4a4a" xlink:to="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_QFourTwoThousandTwentyPlanMember_e2112597-338f-4469-8208-3b37ac61e673" xlink:href="avnw-20210101.xsd#avnw_QFourTwoThousandTwentyPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_QFourTwoThousandTwentyPlanMember_e2112597-338f-4469-8208-3b37ac61e673" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_QThreeTwoThousandTwentyPlanMember_685b7b9f-5c2b-429c-a2d8-d4b03ece260e" xlink:href="avnw-20210101.xsd#avnw_QThreeTwoThousandTwentyPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_QThreeTwoThousandTwentyPlanMember_685b7b9f-5c2b-429c-a2d8-d4b03ece260e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_FiscalTwoThousandTwentyPlanMember_dba8f13c-8f71-4394-8bd4-4170f4c1da90" xlink:href="avnw-20210101.xsd#avnw_FiscalTwoThousandTwentyPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_FiscalTwoThousandTwentyPlanMember_dba8f13c-8f71-4394-8bd4-4170f4c1da90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_FiscalTwoThousandEighteenToNineteenPlanMember_a542b78e-bf12-4540-89c1-10649e156cad" xlink:href="avnw-20210101.xsd#avnw_FiscalTwoThousandEighteenToNineteenPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_FiscalTwoThousandEighteenToNineteenPlanMember_a542b78e-bf12-4540-89c1-10649e156cad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_PriorYearsPlanMember_2fd850c8-e371-4db5-b5be-e60e534acba9" xlink:href="avnw-20210101.xsd#avnw_PriorYearsPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_PriorYearsPlanMember_2fd850c8-e371-4db5-b5be-e60e534acba9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_FiscalTwoThousandFifteenToSixteenPlanMember_84d03375-5f01-4671-acf8-77338cb97185" xlink:href="avnw-20210101.xsd#avnw_FiscalTwoThousandFifteenToSixteenPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_56d287fa-3073-46bf-840f-c762eab49901" xlink:to="loc_avnw_FiscalTwoThousandFifteenToSixteenPlanMember_84d03375-5f01-4671-acf8-77338cb97185" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/IncomeTaxes" xlink:type="simple" xlink:href="avnw-20210101.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/IncomeTaxes" xlink:type="extended" id="i01271fe9c34f4cb2bdc1b950a7fb4784_IncomeTaxes"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="i0c4ac9237bf6436eaf08c2180d1f571c_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_2ebe3c3f-0d5e-4eba-a88c-643e9b8ffd9f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_2ebe3c3f-0d5e-4eba-a88c-643e9b8ffd9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_3ebddc73-5d40-42a9-987d-8c9eb24a8b4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_3ebddc73-5d40-42a9-987d-8c9eb24a8b4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority_f0d0e224-fb4d-4236-a56f-2d35c21bafe4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:to="loc_us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority_f0d0e224-fb4d-4236-a56f-2d35c21bafe4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_IncomeTaxesReceivableAlternativeMinimumTaxCARESAct_5d7f9ab2-ea8c-4838-a2f6-58491047e609" xlink:href="avnw-20210101.xsd#avnw_IncomeTaxesReceivableAlternativeMinimumTaxCARESAct"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:to="loc_avnw_IncomeTaxesReceivableAlternativeMinimumTaxCARESAct_5d7f9ab2-ea8c-4838-a2f6-58491047e609" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_1ac7d2a0-5d66-4ec3-bca3-ea8f4932868a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_5d3a5df5-8f27-4534-8473-9a842694f848" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_1ac7d2a0-5d66-4ec3-bca3-ea8f4932868a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_03d6bb23-b0d2-4c38-8fdd-069dad7ae302" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_1ac7d2a0-5d66-4ec3-bca3-ea8f4932868a" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_03d6bb23-b0d2-4c38-8fdd-069dad7ae302" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_03d6bb23-b0d2-4c38-8fdd-069dad7ae302_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_03d6bb23-b0d2-4c38-8fdd-069dad7ae302" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_03d6bb23-b0d2-4c38-8fdd-069dad7ae302_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_ba5fdf26-31fa-4d53-8b79-28259f2f20ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_03d6bb23-b0d2-4c38-8fdd-069dad7ae302" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_ba5fdf26-31fa-4d53-8b79-28259f2f20ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_FinancialAdministrationOfTheRepublicOfSloveniaMember_b52d0539-6fea-4816-b8e8-3a34cf4fc05b" xlink:href="avnw-20210101.xsd#avnw_FinancialAdministrationOfTheRepublicOfSloveniaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_ba5fdf26-31fa-4d53-8b79-28259f2f20ca" xlink:to="loc_avnw_FinancialAdministrationOfTheRepublicOfSloveniaMember_b52d0539-6fea-4816-b8e8-3a34cf4fc05b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecretariatOfTheFederalRevenueBureauOfBrazilMember_e4f7c20b-1345-4d7c-8dae-07f88bb0a79e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecretariatOfTheFederalRevenueBureauOfBrazilMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_ba5fdf26-31fa-4d53-8b79-28259f2f20ca" xlink:to="loc_us-gaap_SecretariatOfTheFederalRevenueBureauOfBrazilMember_e4f7c20b-1345-4d7c-8dae-07f88bb0a79e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStock" xlink:type="simple" xlink:href="avnw-20210101.xsd#NetIncomeLossPerShareofCommonStock"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStock" xlink:type="extended" id="icc11d46245414a01ac988dfe152c7057_NetIncomeLossPerShareofCommonStock"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockTables" xlink:type="simple" xlink:href="avnw-20210101.xsd#NetIncomeLossPerShareofCommonStockTables"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockTables" xlink:type="extended" id="i1a30a07f9cd840d5b3545273ae038bfc_NetIncomeLossPerShareofCommonStockTables"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofEarningsPerShareBasicandDilutedDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#NetIncomeLossPerShareofCommonStockScheduleofEarningsPerShareBasicandDilutedDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofEarningsPerShareBasicandDilutedDetails" xlink:type="extended" id="id8a70b132c554252aa6ec0930e4978b4_NetIncomeLossPerShareofCommonStockScheduleofEarningsPerShareBasicandDilutedDetails"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails" xlink:type="extended" id="i558ab5ee42ca4f38be660ed4c85ac3fd_NetIncomeLossPerShareofCommonStockScheduleofCommonStockExcludedBecausetheywereAntidilutiveDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7dce8b12-2e22-4404-a986-264c19bfa70e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_4d77bfd0-7c50-4f45-849d-c2ef879f2580" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7dce8b12-2e22-4404-a986-264c19bfa70e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_4d77bfd0-7c50-4f45-849d-c2ef879f2580" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e848d67-b46b-491b-a779-71e983c20b35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7dce8b12-2e22-4404-a986-264c19bfa70e" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e848d67-b46b-491b-a779-71e983c20b35" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4762c2a9-04e1-430d-947a-47402bc21d27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e848d67-b46b-491b-a779-71e983c20b35" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4762c2a9-04e1-430d-947a-47402bc21d27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_4762c2a9-04e1-430d-947a-47402bc21d27_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4762c2a9-04e1-430d-947a-47402bc21d27" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_4762c2a9-04e1-430d-947a-47402bc21d27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3b928d04-bf6a-4026-97b1-954761823818" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_4762c2a9-04e1-430d-947a-47402bc21d27" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3b928d04-bf6a-4026-97b1-954761823818" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_cb405c09-4f74-466c-93cd-f7b80db4b6e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3b928d04-bf6a-4026-97b1-954761823818" xlink:to="loc_us-gaap_EmployeeStockOptionMember_cb405c09-4f74-466c-93cd-f7b80db4b6e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_b4cd4aba-549d-44c6-8aca-d6a6facebdce" xlink:href="avnw-20210101.xsd#avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_3b928d04-bf6a-4026-97b1-954761823818" xlink:to="loc_avnw_RestrictedStockRestrictedStockUnitsPerformanceSharesandPerformanceUnitsMember_b4cd4aba-549d-44c6-8aca-d6a6facebdce" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="avnw-20210101.xsd#CommitmentsandContingencies"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CommitmentsandContingencies" xlink:type="extended" id="i94a8a4daa81341288208382aba57cb40_CommitmentsandContingencies"/>
  <link:roleRef roleURI="http://www.us.aviatnetworks.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="avnw-20210101.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.us.aviatnetworks.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended" id="i88f4b8cfccca4654a2728a93fe65a7e4_CommitmentsandContingenciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_6fcf4e25-80ee-45a7-b5ca-022e8a5c7d40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentAmount_8a522803-e244-45ab-a2e9-d70d7b65c29c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermPurchaseCommitmentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_6fcf4e25-80ee-45a7-b5ca-022e8a5c7d40" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentAmount_8a522803-e244-45ab-a2e9-d70d7b65c29c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_avnw_TermofFinancialGuarantees_d82ed25e-1dd2-4509-960e-2db410117253" xlink:href="avnw-20210101.xsd#avnw_TermofFinancialGuarantees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_6fcf4e25-80ee-45a7-b5ca-022e8a5c7d40" xlink:to="loc_avnw_TermofFinancialGuarantees_d82ed25e-1dd2-4509-960e-2db410117253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_f8b433f8-b6a8-492e-aea8-244d140a2a45" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_6fcf4e25-80ee-45a7-b5ca-022e8a5c7d40" xlink:to="loc_us-gaap_OtherCommitment_f8b433f8-b6a8-492e-aea8-244d140a2a45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_c4206a70-8449-4728-bfbb-c29f9875d38c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems_6fcf4e25-80ee-45a7-b5ca-022e8a5c7d40" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_c4206a70-8449-4728-bfbb-c29f9875d38c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_5aaa5d01-e4de-488c-8c37-ccb3153c8922" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_c4206a70-8449-4728-bfbb-c29f9875d38c" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_5aaa5d01-e4de-488c-8c37-ccb3153c8922" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_5aaa5d01-e4de-488c-8c37-ccb3153c8922_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_5aaa5d01-e4de-488c-8c37-ccb3153c8922" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_5aaa5d01-e4de-488c-8c37-ccb3153c8922_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_54ad4d7a-647e-44e3-a14a-eb88c11bc9e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_5aaa5d01-e4de-488c-8c37-ccb3153c8922" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_54ad4d7a-647e-44e3-a14a-eb88c11bc9e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoriesMember_c15f2ce6-b224-4c08-9ca5-7f92e707bc09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_54ad4d7a-647e-44e3-a14a-eb88c11bc9e2" xlink:to="loc_us-gaap_InventoriesMember_c15f2ce6-b224-4c08-9ca5-7f92e707bc09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicensingAgreementsMember_9b492f80-79e1-4179-a40d-0611575ce9dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LicensingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_54ad4d7a-647e-44e3-a14a-eb88c11bc9e2" xlink:to="loc_us-gaap_LicensingAgreementsMember_9b492f80-79e1-4179-a40d-0611575ce9dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseByMajorPropertyClassTable_c4206a70-8449-4728-bfbb-c29f9875d38c" xlink:to="loc_srt_RangeAxis_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc_default" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc" xlink:to="loc_srt_RangeMember_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f31e64e9-7353-4069-8149-0d80e6b047bb" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0b956cbf-6d69-4fb7-a645-1bb7b20dd6bc" xlink:to="loc_srt_RangeMember_f31e64e9-7353-4069-8149-0d80e6b047bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_af2f657a-7d95-4b85-a218-ccaea9eae4ed" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f31e64e9-7353-4069-8149-0d80e6b047bb" xlink:to="loc_srt_MaximumMember_af2f657a-7d95-4b85-a218-ccaea9eae4ed" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
