/ Dictionary / Index C copartner: Meaning and Definition of Find definitions for: co•part•ner Pronunciation: (kō-pärt'nur, kō'pärt"-), [key] — n. a partner or associate, as in a business. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: copartner (Thesaurus) co-parent copasetic Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language