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Freebase(0.00 / 0 votes)Rate this definition: Billet. A billet is a term for living quarters to which a soldier is assigned to sleep. Historically, it referred to a private dwelling that was required to accept the soldier.
BILLET DOUX Dictionary entry overview: What does billet doux mean? â¢ BILLET DOUX (noun) The noun BILLET DOUX has 1 sense: 1. a personal letter to a loved one expressing affection Familiarity information: BILLET DOUX used as a noun is very rare.