noun
- A secret word or phrase known only to a restricted group.
- usage: "he forgot the password"
- synonyms: watchword, word, parole, countersign
Passcode and Password
WordNet 3.0 © 2006 by Princeton University
Webster's Revised Unabridged Dictionary
(DoD, NATO) A secret word or distinctive sound used to reply to a challenge. See also challenge; countersign.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.