Key-Encryption Key definition in Computer Security terms:
Definition(s): A cryptographic key that is used for the encryption or decryption of other keys.
Source(s): NIST SP 800-57 Part 3 Rev. 1
The key for the underlying block cipher of KW, KWP, or TKW. May be called a key-wrapping key in other documents.
Source(s): NIST SP 800-38F
reference: CSRC Glossary