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Definition of First sergeant
1. Noun. A sergeant in the Army above the rank of staff sergeant and below master sergeant.
Specialized synonyms: Orderly Sergeant
Generic synonyms: Sergeant
Definition of First sergeant
1. Noun. (American English) In the United States Army, a non-commissioned officer ranking above sergeant first class and below sergeant major; equal in rank to a master sergeant but with greater command authority. ¹
2. Noun. (American English) In the United States Marine Corps, a non-commissioned officer ranking above gunnery sergeant and below sergeant major or master gunnery sergeant; equal in rank to a master sergeant, but with command rather than technical responsibilities. ¹
3. Noun. (American English) In the United States Air Force, an appointment (not a rank) for the senior member of enlisted personnel in a squadron or other unit. The appointment is usually held by a master sergeant. ¹
¹ Source: wiktionary.com