sergeant major

noun

1. 1.A senior non-commissioned appointment in the Army of a company or unit, directly responsible to the officer in charge for their soldiers' performance, standards, discipline, morale, welfare, et al, that can be held by a Warrant Officer or above.
2. 2.(plural sergeants major) The most senior rank of non-commissioned officer in the United States Army, ranking above a first sergeant. In the United States Marine Corps it ranks above First Sergeant and is equal in grade to Master Gunnery Sergeant.
3. 3.(plural sergeant majors) An appointment (not a rank) in the British Army and Royal Marines, denoting the most senior non-commissioned officer in a battalion, regiment or company.
4. 4.(plural sergeant majors) An appointment (not a rank) in the Singapore Army and National Cadet Corps, denoting the most senior non-commissioned officer in a battalion, regiment, company or unit.
5. 5.A fish, the pintano (Abudefduf saxatilis).