: a window sash that opens on hinges at the side
also : a window with such a sash

Examples of casement in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
At Colin King’s new Manhattan apartment, on the 11th floor of a 1930 Chelsea building, casement windows and a generous terrace look out across neighboring rooftops, the city unfolding in a postcard-perfect sweep. — Sam Cochran, Architectural Digest, 16 Oct. 2026 Steel casement windows and oversize doors used throughout the house are salvaged. — Marissa Gluck, Los Angeles Times, 6 Oct. 2026 The lovely south-facing casement windows in the living room are original; at the other end of the apartment is enough room for a second bedroom or office, plus a closet). — Matthew Sedacca, Curbed, 5 Oct. 2026 In addition to its striking white stucco and red brick exterior with a terra cotta frieze done by artist Edgar Miller, the inside is light and airy with one-of-a-kind art glass casement windows. — Rachel Freundt, Chicago Tribune, 17 July 2026 See All Example Sentences for casement

Word History

Etymology

Middle English, hollow molding

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of casement was in the 15th century

Browse Nearby Words

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Cite this Entry

“Casement.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/casement. Accessed 20 Oct. 2026.

Kids Definition

1
: a window frame opening on hinges like a door
2
: a window with a casement

Biographical Definition

Casement

biographical name

Sir Roger David 1864–1916 Irish rebel
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