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Meaning of sergeant major

ser'geant ma'jor

Pronunciation: [key]
  1. a noncommissioned officer serving as chief administrative assistant in a unit headquarters.
  2. a noncommissioned officer ranking above a first sergeant.
  3. a small damselfish, Abudefduf saxatilis, inhabiting warm Atlantic waters, having vertical black stripes on each side.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.