/ Dictionary / Index C coextensive: Meaning and Definition of Find definitions for: co•ex•ten•sive Pronunciation: (kō"ik-sten'siv), [key] — adj. equal or coincident in space, time, or scope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coextensive (Thesaurus) coextend coextrusion Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language