English

Noun

master sergeant ‎(plural master sergeants)

1. (military, US) A non-commissioned officer in the United States Army, ranking above sergeant first class and below sergeant major; equal in grade and pay to a first sergeant.
2. (military, US) A non-commissioned officer in the United States Marine Corps, ranking above gunnery sergeant and below master gunnery sergeant or sergeant major.
3. (military, US) A non-commissioned officer in the United States Air Force, ranking above technical sergeant and below senior master sergeant.

References

• US Army Ranks and Insignia
• Enlisted Rank Insignia, US Department of Defense