Meanings
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1
noun
a window sash hinged at the side so that it opens like a door, or a window fitted with such a sash
She pushed the casement outward and let the cool evening air into the room.
Thesaurus
Etymology
From Middle English casement, originally an architectural term for a hollow molding. The word later came to denote a framed window opening, then specifically a sash hinged at the side. This common noun is unrelated to the Irish surname Casement, whose etymology was mistakenly attached to the raw record.