/ Dictionary / Index C c'mon: Meaning and Definition of Find definitions for: c'mon Pronunciation: (kmon, ku-mon'), [key] — Informal. Informal. contraction of come on. See(defs. 45e, f&hasp;). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cml. CMOS Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language