sergeant major

noun
1.
U.S. Army, Air force, and Marine Corps. a noncommissioned officer serving as chief administrative assistant in a unit headquarters.
2.
U.S. Marine Corps. 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.

Origin:
1565–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sergeant major
 
n
1.  a noncommissioned officer of the highest rank or having specific administrative tasks in branches of the armed forces of various countries
2.  a large damselfish, Abudefduf saxatilis, having a bluish-grey body marked with black stripes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Look at the sergeant major at attention to see the whole compensatory mechanism in action.
They spent nearly the entire day waiting outside the sergeant major's office, unable to leave even for lunch.
He is deployed with the battalion again, this time as its command sergeant major.
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