A secret word or signal given in response to a password, used for verification or mutual identification in security contexts.
From counter- (reciprocal, opposite) + parole (from French parole, 'word' or 'spoken word'). Originally a military term where two passwords exchanged verified the identity of both parties.
During World War II, soldiers used counterparoles as a crucial security measure—knowing the right password wasn't enough; you also needed to know the right response to prove you weren't a spy pretending to be one of your own troops.
Complete word intelligence in one call. Free tier — 50 lookups/day.