/ Dictionary / Index C chief petty officer: Meaning and Definition of Find definitions for: chief' pet'ty of"ficer Pronunciation: [key] — U.S. Navy and Coast Guard. U.S. Navy and Coast Guard. a noncommissioned rank above petty officer first class and below senior petty officer. Abbr.: CPO, C.P.O., c.p.o. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chief of state chieftain Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language