noun
1.
a word or phrase that must be spoken by a person before he may pass a guard
give the password before entering the fort
Synonyms: countersign, watchword, word
Related Word: tessera
2.
Synonyms: passport , key, open sesame, ticket
3.
something (as a short phrase) used as a sign of recognition among members of the same society, class, or group
a fraternity that has secret handshakes and passwords
Synonyms: watchword, word