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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.
Best Answer: Billet is a generic term for a hunk of raw material that has been processed by removing materials to make the final part. Fact is, you can carve a bar ...