Definify.com
Webster 1913 Edition
Casement
Case′ment
,Noun.
(Arch.)
A window sash opening on hinges affixed to the upright side of the frame into which it is fitted.
(Poetically)
A window. A
casement
of the great chamber window. Shakespeare
Webster 1828 Edition
Casement
CASEMENT
,Noun.
1.
A hollow molding, usually one sixth or one fourth of a circle.2.
A little movable window, usually within a large, made to turn and open on hinges.