A window that opens on hinges at the side, like a door.
From Old French 'cassement' meaning 'frame' or 'border,' derived from 'casse' meaning 'case' or 'box.' The window got its name because it sits within a 'case' or frame that allows it to swing open. The root is the same as 'case' — casement windows are literally 'cased' windows, sitting in frames that act like boxes or cases. The hinged opening mechanism was secondary to the framing concept in the original naming.
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