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Intermediate Certification Authority (CA)


  A CA that is signed by a superior CA (e.g., a Root CA or another Intermediate CA) and signs CAs (e.g., another Intermediate or Subordinate CA). The Intermediate CA exists in the middle of a trust chain between the Trust Anchor, or Root, and the subscriber certificate issuing Subordinate CAs.
CNSSI 4009-2015 from CNSSI 1300

  A CA that is subordinate to another CA, and has a CA subordinate to itself.
NIST SP 800-32 under Intermediate CA