/ Dictionary / Index C Cosimo: Meaning and Definition of Find definitions for: Co•si•mo Pronunciation: (kō'zu-mō"It.kô'zē-mô), [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cosigner cosine Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language