'Casement' definitions:

Definition of 'casement'

From: WordNet
noun
A window sash that is hinged (usually on one side)

Definition of 'Casement'

From: GCIDE
  • Casement \Case"ment\, n. [Shortened fr. encasement. See {Incase 1st Case}, and cf. Incasement.] (Arch.) A window sash opening on hinges affixed to the upright side of the frame into which it is fitted. (Poetically) A window. [1913 Webster]
  • A casement of the great chamber window. --Shak. [1913 Webster]

Definition of 'Casement'

From: Easton
  • Casement a barrier of open-work placed before windows (Prov. 7:6). In Judg. 5:28 the Hebrew word is rendered "lattice," in the LXX. "network," an opening through which cool air is admitted.