/ Dictionary / Index C coliseum: Meaning and Definition of Find definitions for: col•i•se•um Pronunciation: (kol"i-sē'um), [key] — n. an amphitheater, stadium, large theater, or other special building for public meetings, sporting events, exhibitions, etc. (cap.) Colosseum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coliseum (Thesaurus) coliphage coliseum ivy Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language