/ Dictionary / Index C Cosby: Meaning and Definition of Find definitions for: Cos•by Pronunciation: (kôz'bē, koz'-), [key] (Bill&hasp;), born 1937, U.S. comedian and actor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cosa Nostra coscenarist 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