Keychain definition
A small chain or strap for holding keys, a fob, etc.
noun
(1) The password management system in the Mac. Introduced in Mac OS 8.6 to keep track of logins for multiple email accounts, the Keychain was later enhanced to include passwords for networks, applications and the Internet, as well as for encryption keys and digital certificates.
An ornamental piece holding such a chain or ring.
noun
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Other Word Forms
Noun
Singular:
keychain
Plural:
key-chains, keychains