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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.
To help Marines advance, many choose a B-Billet, or a duty outside of their normal military occupational specialty. âB-Billets are for Marines looking for career progression,â said Staff Sgt. Talisha Robbins, the Headquarters & Service Battalion career planner, from Akron, Ohio.