a noncommissioned officer of the highest rank or having specific administrative tasks in branches of the armed forces of various countries
WordReference Random House Unabridged Dictionary of American English © 2026
ser′geant ma′jor,
- Military[U.S. Army, Air Force, and Marine Corps.]a noncommissioned officer serving as chief administrative assistant in a unit headquarters.
- Military[U.S. Marine Corps.]a noncommissioned officer ranking above a first sergeant.
- Fisha small damselfish, Abudefduf saxatilis, inhabiting warm Atlantic waters, having vertical black stripes on each side.
- 1565–75
Collins Concise English Dictionary © HarperCollins Publishers::
'sergeant major' also found in these entries (note: many are not synonyms or translations):
CSM
- RSM
- SM
- Sgt. Maj.
- company sergeant major
- cow pilot
- crown
- major
- pintano
- regimental sergeant major
- staff sergeant major
- warrant officer