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sergeant major Definition

sergeant major

noun pl. sergeants major

  1. the chief administrative noncommissioned officer in a military headquarters: an occupational title and not a rank
  2. U.S. Army, U.S. Marine Corps the highest ranking noncommissioned officer
  3. a small damselfish (Abudefduf saxatilis) with several dark, wide, vertical stripes on its bright-yellowish upper body