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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e7032-f32d-758f-acc7-4de0bd456b92,g:e3246d63-255d-4891-983a-1728f008eb98-->
<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://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#ClassOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_oef_ShareClassDomain" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#oef_ShareClassDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000099278Member_019e7032-f32d-718c-abdf-6c6733649c1e" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000099278Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000099278Member_019e7032-f32d-718c-abdf-6c6733649c1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000099279Member_019e7032-f32d-7519-b8fc-a3ceb9e81aed" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000099279Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000099279Member_019e7032-f32d-7519-b8fc-a3ceb9e81aed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000189665Member_019e7032-f32d-7212-9cd9-add88497da36" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000189665Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000189665Member_019e7032-f32d-7212-9cd9-add88497da36" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000099280Member_019e7032-f32d-7a59-9fbe-63f2dc170e34" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000099280Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000099280Member_019e7032-f32d-7a59-9fbe-63f2dc170e34" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000099281Member_019e7032-f32d-7fbf-acb7-df49886acda0" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000099281Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000099281Member_019e7032-f32d-7fbf-acb7-df49886acda0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000099282Member_019e7032-f32d-7b36-bb1a-6647738c3df4" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000099282Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000099282Member_019e7032-f32d-7b36-bb1a-6647738c3df4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000189666Member_019e7032-f32d-76bf-9084-1ff0a8712e84" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000189666Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000189666Member_019e7032-f32d-76bf-9084-1ff0a8712e84" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000131610Member_019e7032-f32d-78dc-a0f2-a8bb0743a2de" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000131610Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000131610Member_019e7032-f32d-78dc-a0f2-a8bb0743a2de" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000236116Member_019e7032-f32d-7ad7-9c2c-e46115824fca" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000236116Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000236116Member_019e7032-f32d-7ad7-9c2c-e46115824fca" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000015882Member_019e7032-f32d-758b-8296-c4c1960fa755" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000015882Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000015882Member_019e7032-f32d-758b-8296-c4c1960fa755" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000015884Member_019e7032-f32d-7e52-bb67-5b8e28ee0ab3" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000015884Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000015884Member_019e7032-f32d-7e52-bb67-5b8e28ee0ab3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000189663Member_019e7032-f32d-76bc-b0da-575deaabc80f" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000189663Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000189663Member_019e7032-f32d-76bc-b0da-575deaabc80f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000015883Member_019e7032-f32d-791a-9ac4-c263379bba04" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000015883Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000015883Member_019e7032-f32d-791a-9ac4-c263379bba04" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000050996Member_019e7032-f32d-7a5b-a933-cf7214cb7b28" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000050996Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000050996Member_019e7032-f32d-7a5b-a933-cf7214cb7b28" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000050997Member_019e7032-f32d-7c9b-a950-82990bda5217" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000050997Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000050997Member_019e7032-f32d-7c9b-a950-82990bda5217" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000189664Member_019e7032-f32d-769c-a4ab-e4cd30f342f6" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000189664Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000189664Member_019e7032-f32d-769c-a4ab-e4cd30f342f6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_C000131605Member_019e7032-f32d-7ed6-bb79-a3a4266b3175" xlink:href="ck0000908186-20260430.xsd#ck0000908186_C000131605Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_ShareClassDomain" xlink:to="loc_ck0000908186_C000131605Member_019e7032-f32d-7ed6-bb79-a3a4266b3175" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_ShortTermInvestmentMember_019e7032-f32d-7aa3-8715-e3012fdffac3" xlink:href="ck0000908186-20260430.xsd#ck0000908186_ShortTermInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:to="loc_ck0000908186_ShortTermInvestmentMember_019e7032-f32d-7aa3-8715-e3012fdffac3" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_OtherAssetsAndLiabilitiesMember_019e7032-f32d-740c-9f77-e47bf55c1a1f" xlink:href="ck0000908186-20260430.xsd#ck0000908186_OtherAssetsAndLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:to="loc_ck0000908186_OtherAssetsAndLiabilitiesMember_019e7032-f32d-740c-9f77-e47bf55c1a1f" xlink:type="arc" order="32"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#IndustrySectorOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_oef_IndustrySectorDomain" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#oef_IndustrySectorDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HealthCareMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HealthCareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_IndustrySectorDomain" xlink:to="loc_us-gaap_HealthCareMember" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_DataCentersMember_019e7032-f32d-78c1-b226-47ee9bc81aa9" xlink:href="ck0000908186-20260430.xsd#ck0000908186_DataCentersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_IndustrySectorDomain" xlink:to="loc_ck0000908186_DataCentersMember_019e7032-f32d-78c1-b226-47ee9bc81aa9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetailMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetailMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_IndustrySectorDomain" xlink:to="loc_us-gaap_RetailMember" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_IndustrialMember_019e7032-f32d-7b27-b219-c148cf228ead" xlink:href="ck0000908186-20260430.xsd#ck0000908186_IndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_IndustrySectorDomain" xlink:to="loc_ck0000908186_IndustrialMember_019e7032-f32d-7b27-b219-c148cf228ead" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ck0000908186_TelecommunicationsMember_019e7032-f32d-75b9-9fbe-7a0959800e53" xlink:href="ck0000908186-20260430.xsd#ck0000908186_TelecommunicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oef_IndustrySectorDomain" xlink:to="loc_ck0000908186_TelecommunicationsMember_019e7032-f32d-75b9-9fbe-7a0959800e53" xlink:type="arc" order="14"/>
  </link:definitionLink>
</link:linkbase>
