/ Dictionary / Index N N.C.O.: Meaning and Definition of Find definitions for: N.C.O. Pronunciation: [key] Noncommissioned Officer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. NCCJ NCPAC Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language