An official in charge of a government department, especially a police force.
Someone commissioned to perform certain duties.
A member of a commission.
Someone who commissions something.
A commissioned officer in the United States Coast Guard, Public Health Service, or National Atmospheric and Oceanic Administration whose rank is above an ensign and below a lieutenant.
A commissioned officer of the United States Navy whose rank is above an ensign's and below a lieutenant, or a corresponding rank in other navies.