(Canada) A senior, noncommissioned appointment in the Army of a company or unit, directly responsible to the officer in charge for their soldiers' performance, standards, discipline, morale, welfare, et al, that can be held by a Warrant Officer or above.
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(US, plural sergeants major) 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.
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(British, plural sergeant majors) 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.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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