/ Dictionary / Index C chief mate: Meaning and Definition of Find definitions for: chief' mate' Pronunciation: [key] — Naut. Naut. SeeAlso called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chief master sergeant Chief of Naval Operations Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language