/ Dictionary / Index C cofounder: Meaning and Definition of Find definitions for: co•found•er Pronunciation: (kō-foun'dur), [key] — n. a person who founds or establishes something with another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cofounder (Thesaurus) cofinal C. of S. Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language