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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.
The noun BILLET DOUX has 1 sense: 1  1. a personal letter to a loved one expressing affection. 2  Meaning: 3  A personal letter to a loved one expressing affection. 4  Classified under: 5  Nouns denoting communicative processes and contents. 6  Synonyms: 7  billet doux; love letter. 8  Hypernyms (billet doux is a kind of...):