- a window frame that opens on hinges along the side: a casement window often has two such frames, opening like French doors
- a casing; covering
Origin of casementMiddle English aphetic for Old French dial an unverified form encassement (OFr enchassement) from en-, en- + casse, case + -ment, -ment
1864-1916; Ir. nationalist: hanged by the British as a traitor in WWI
- a. A window sash that opens outward by means of hinges.b. A window with such sashes.
- A case or covering.
Origin of casementMiddle English a hollow molding possibly from Middle English case chest, frame ; see case 2.