/ Dictionary / Index C COA: Meaning and Definition of Find definitions for: COA Pronunciation: [key] change of address. CoA Pronunciation: [key] coenzyme A. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. CO coacervate Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language