/ Dictionary / Index C commence: Meaning and Definition of Find definitions for: com•mence Pronunciation: (ku-mens'), [key] — -menced, -menc•ing. to begin; start. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: commence (Thesaurus) commemoratory commencement Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language