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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a15b24-e8a7-713c-b2f8-645dd2895a0c,g:e9f2e763-faf0-4dfc-a7da-8ea05cb78bc3-->
<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.caci.com/role/Cover" xlink:type="simple" xlink:href="caci-20261020.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.caci.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_01a15b24-e8a7-7d74-bc4b-290f20ccb519" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_DocumentInformationTable_01a15b24-e8a7-7d74-bc4b-290f20ccb519" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_01a15b24-e8a7-7103-aacd-09d8290d2b0c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_01a15b24-e8a7-7d74-bc4b-290f20ccb519" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_01a15b24-e8a7-7103-aacd-09d8290d2b0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_01a15b24-e8a7-7103-aacd-09d8290d2b0c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_01a15b24-e8a7-7103-aacd-09d8290d2b0c" xlink:to="loc_dei_AddressTypeDomain_01a15b24-e8a7-7103-aacd-09d8290d2b0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_01a15b24-e8a7-7da7-9d44-d8a2abc647df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_01a15b24-e8a7-7103-aacd-09d8290d2b0c" xlink:to="loc_dei_AddressTypeDomain_01a15b24-e8a7-7da7-9d44-d8a2abc647df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_FormerAddressMember_01a15b24-e8a7-727a-9904-5da108fabcee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_FormerAddressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_01a15b24-e8a7-7da7-9d44-d8a2abc647df" xlink:to="loc_dei_FormerAddressMember_01a15b24-e8a7-727a-9904-5da108fabcee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a15b24-e8a7-71ec-8aeb-f5cf8a38ff6c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_DocumentType_01a15b24-e8a7-71ec-8aeb-f5cf8a38ff6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a15b24-e8a7-702c-be0b-71c01be27387" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_DocumentPeriodEndDate_01a15b24-e8a7-702c-be0b-71c01be27387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a15b24-e8a7-7cff-b261-31849b4e9d6e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityRegistrantName_01a15b24-e8a7-7cff-b261-31849b4e9d6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a15b24-e8a7-7040-830d-1ae7faca2e3b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a15b24-e8a7-7040-830d-1ae7faca2e3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a15b24-e8a7-770e-9afd-1194c9f83d9c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityFileNumber_01a15b24-e8a7-770e-9afd-1194c9f83d9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a15b24-e8a7-7268-afd5-98ec49e570fa" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a15b24-e8a7-7268-afd5-98ec49e570fa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a15b24-e8a7-77c4-acbf-6c8d550204e2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityAddressAddressLine1_01a15b24-e8a7-77c4-acbf-6c8d550204e2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a15b24-e8a7-79af-9d18-02cff6d257c0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityAddressCityOrTown_01a15b24-e8a7-79af-9d18-02cff6d257c0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a15b24-e8a7-7e68-8843-060b7d90f3ae" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityAddressStateOrProvince_01a15b24-e8a7-7e68-8843-060b7d90f3ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a15b24-e8a7-710c-a13e-f4254cff8994" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityAddressPostalZipCode_01a15b24-e8a7-710c-a13e-f4254cff8994" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a15b24-e8a7-73fe-b737-88ab81b7e020" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_CityAreaCode_01a15b24-e8a7-73fe-b737-88ab81b7e020" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a15b24-e8a7-7b81-a8d1-354cff13b6b6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_LocalPhoneNumber_01a15b24-e8a7-7b81-a8d1-354cff13b6b6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_01a15b24-e8a7-77ac-987c-00ea5912d7ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_WrittenCommunications_01a15b24-e8a7-77ac-987c-00ea5912d7ed" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_01a15b24-e8a7-7929-9aeb-5c9fd779ec07" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_SolicitingMaterial_01a15b24-e8a7-7929-9aeb-5c9fd779ec07" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_01a15b24-e8a7-7355-a253-e34dbcf13ea7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_PreCommencementTenderOffer_01a15b24-e8a7-7355-a253-e34dbcf13ea7" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_01a15b24-e8a7-72a9-b9c3-66e22f72625b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_01a15b24-e8a7-72a9-b9c3-66e22f72625b" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a15b24-e8a7-7449-b405-1e0ab6d03cee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_Security12bTitle_01a15b24-e8a7-7449-b405-1e0ab6d03cee" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a15b24-e8a7-77cd-9855-72a317d0cdf3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_TradingSymbol_01a15b24-e8a7-77cd-9855-72a317d0cdf3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a15b24-e8a7-7844-aa0f-6f5b2f55443b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_SecurityExchangeName_01a15b24-e8a7-7844-aa0f-6f5b2f55443b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a15b24-e8a7-7148-8712-d14a58111e35" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a15b24-e8a7-7148-8712-d14a58111e35" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a15b24-e8a7-7c3d-8e04-c29a95503ddb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_EntityCentralIndexKey_01a15b24-e8a7-7c3d-8e04-c29a95503ddb" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a15b24-e8a7-79b8-a38a-bdb532ecd479" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_AmendmentFlag_01a15b24-e8a7-79b8-a38a-bdb532ecd479" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_01a15f20-407b-74f0-941b-1397db4afb20" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a15b24-e8a7-7df6-b925-8e472d6db78c" xlink:to="loc_dei_CurrentFiscalYearEndDate_01a15f20-407b-74f0-941b-1397db4afb20" xlink:type="arc" order="22"/>
  </link:definitionLink>
</link:linkbase>
