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casement ‎(plural casements)

  1. A window sash that is hinged on the side and opens outward.
  2. A window having such sashes; a casement window.Wp
    • 1873, James Thomson (B.V.), The City of Dreadful Night
      The street-lamps always burn; but scarce a casement / In house or palace front from roof to basement / Doth glow or gleam athwart the mirk air cast.
    • 1907, Robert W. Chambers, chapter I, The Younger Set:
      The house was a big elaborate limestone affair, evidently new. Winter sunshine sparkled on lace-hung casement, on glass marquise, and the burnished bronze foliations of grille and door.
  3. (military) A casemate.