/ Dictionary / Index C composure: Meaning and Definition of Find definitions for: com•po•sure Pronunciation: (kum-pō'zhur), [key] — n. serene, self-controlled state of mind; calmness; tranquillity: Despite the hysteria and panic around him, he retained his composure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: composure (Thesaurus) compost compotation 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