/ Dictionary / Index C copay: Meaning and Definition of Find definitions for: co•pay Pronunciation: (kō'pā"), [key] a fixed amount, or a percentage of the usual and customary fee for a medical service, payable by an insured to a health insurance carrier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. copasetic copayment Related Content Daily Word Quiz: sumptuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language