Master-sergeant definition

One who holds the rank of master sergeant.

A noncommissioned rank in the US Army that is above sergeant first class and below the position of sergeant major.

A noncommissioned rank in the US Air Force that is above technical sergeant and below senior master sergeant.

A noncommissioned rank in the US Marine Corps that is above gunnery sergeant and below the position of sergeant major.

(u.s. mil.) A noncommissioned officer of high rank; in the Army, the rank just above sergeant first class; in the Air Force, the rank just above technical sergeant; in the Marine Corps, the rank just above gunnery sergeant.

(military, US) A non-commissioned officer in the United States Army, ranking above sergeant first class and below sergeant major; equal in grade and pay to a first sergeant.

(military, US) A non-commissioned officer in the United States Marine Corps, ranking above gunnery sergeant and below master gunnery sergeant or sergeant major.

(military, US) A non-commissioned officer in the United States Air Force, ranking above technical sergeant and below senior master sergeant.