/ Dictionary / Index C coactive: Meaning and Definition of Find definitions for: co•ac•tive Pronunciation: (kō-ak'tiv), [key] — adj. compulsory; coercive. co•ac•tive Pronunciation: (kō-ak'tiv), [key] — adj. acting together. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coaction coadaptation Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language