/ Dictionary / Index C common room: Meaning and Definition of Find definitions for: com'mon room" Pronunciation: [key] a room or lounge for informal use by all. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. common rhythm common salt Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language