/ Dictionary / Index C casement: Meaning and Definition of Find definitions for: case•ment Pronunciation: (kās'munt), [key] a window sash opening on hinges that are generally attached to the upright side of its frame. Also calleda window with such a sash or sashes. a casing or covering. Case•ment Pronunciation: (kās'munt), [key] 1864–1916, Irish patriot: hanged by the British for treason. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: casement (Thesaurus) casemate casement cloth Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language