Originally a military term for a soldier's assigned quarters or duty, it has crossed over into civilian workplaces to mean a specific job slot or role. It implies a formal position that carries distinct responsibilities and authority, regardless of the person's overall rank or seniority. When someone holds a billet, they own the tasks and decisions associated with that exact desk or station.
Heard on the job
I know he has seniority, but safety inspector is my billet and I say this rigging isn't rated for the load.
Insider tip
Using this term usually signals a speaker with a military or government contracting background.