/ Dictionary / Index C chief master sergeant: Meaning and Definition of Find definitions for: chief' mas'ter ser'geant Pronunciation: [key] the highest noncommissioned officer rank in the U.S. Air Force. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chiefly chief mate Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language