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| 1. | a window sash opening on hinges that are generally attached to the upright side of its frame. |
| 2. | Also called casement window. a window with such a sash or sashes. |
| 3. | a casing or covering. |
casement window
earliest form of movable window, wood or metal framed, with hinges or pivots at the upright side of the vertically hung sash, so that it opens outward or inward along its entire length in the manner of a door. One frame, separately movable, of such a window is called a casement sash.
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