- the chief administrative noncommissioned officer in a military headquarters: an occupational title and not a rank
- ☆ U.S. Army, U.S. Marine Corps the highest ranking noncommissioned officer
- a small damselfish (Abudefduf saxatilis) with several dark, wide, vertical stripes on its bright-yellowish upper body
nounpl. sergeants major sergeants major or sergeant majors
- a. Used as a title for a noncommissioned officer serving as chief administrative assistant of a headquarters unit of the US Army or Marine Corps.b. One who holds this title.
- Chiefly British A noncommissioned or warrant officer of the highest rank in a company or unit of battalion size.
- A damselfish (Abudefduf saxatilis) of warm seas, having a flattened body with dark vertical stripes.
(plural sergeants maj)
- (Canada) A senior non-commissioned appointment in the Army of a company or unit, directly responsible to the officer in charge for their soliders' performance, standards, discipline, morale, welfare, et al, that can be held by a Warrant Officer or above.
- (US) 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.
- (UK) 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.
(plural sergeant-majors or sergeants-major)
- Alternative form of sergeant major.