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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.
Definition of bill. 1 biology : the jaws of a bird together with their horny covering a duck's bill. 2 biology : a mouthpart (as the beak of a turtle) that resembles a bird's bill. 3 nautical : the point of an anchor fluke â see anchor illustration.