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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.
Meaning: A personal letter to a loved one expressing affection. Classified under: Nouns denoting communicative processes and contents. Synonyms: billet doux; love letter. Hypernyms (billet doux is a kind of...): personal letter (a letter dealing with personal affairs)