/ Dictionary / Index C cofinal: Meaning and Definition of Find definitions for: co•fi•nal Pronunciation: (kō-fīn'l), [key] — adj. Math. of or pertaining to a subset of a set with a partial order relation, as “greater than” or “equal to,” in which corresponding to each element in the set is an element in the subset that is in relation to the given element. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Coff 's Harbour cofounder 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