Definify.com
Webster 1913 Edition
Watchword
Watch′wordˊ
,Noun.
1.
A word given to sentinels, and to such as have occasion to visit the guards, used as a signal by which a friend is known from an enemy, or a person who has a right to pass the watch from one who has not; a countersign; a password.
2.
A sentiment or motto; esp., one used as a rallying cry or a signal for action.
Nor deal in
watchwords
overmuch. Tennyson.
Webster 1828 Edition
Watchword
WATCHWORD
,Noun.