/ Dictionary / Index C cos: Meaning and Definition of Find definitions for: cos Pronunciation: (kos, kôs), [key] — n. romaine. cos Pronunciation: [key] cosine. Cos Pronunciation: (kos, kôs), [key] — n. Kos. cos. Pronunciation: [key] companies. consul. consulship. counties. C.O.S. Pronunciation: [key] cash on shipment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cos (Thesaurus) coryza Cosa Nostra Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language