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Definition of sergeant major
1a warrant officer in the British army whose job is to assist the adjutant of a regiment or battalion ( regimental sergeant major) or a subunit commander ( company sergeant major, battery sergeant major, etc.). 2a high rank of non-commissioned officer in the US army, above master sergeant and below warrant officer. 3a fish with boldly striped sides which lives in warm seas, typically on coral reefs.
- Abudefduf saxatilis, family Pomacentridae