Definition from Wiktionary, the free dictionary
See also noncommissioned officer
Alternative forms 
- A person of authority in the military who has not received a commission (a direct conveyance of authority from the sovereign government); as such they can have charge or control but not command in the most technical use of the word.
- A platoon sergeant may only be a non-commissioned officer but he's the one his men look to when the bullets start flying.
person of authority in the military who has not received a commission