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• casement
  casement

  noun

  a window sash opening on hinges that are generally attached to the upright side of its frame.
• Casement
  Casement

  noun

  (Sir) Roger (David), 1864–1916, Irish patriot: hanged by the British for treason.

casement

¹ American  

[kays-muhnt] / ˈkeɪs mənt /

noun

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.

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Casement ² American  

[kays-muhnt] / ˈkeɪs mənt /

noun

1. (Sir) Roger (David), 1864–1916, Irish patriot: hanged by the British for treason.

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casement ¹ British  

/ ˈkeɪsmənt /

noun

1. a window frame that is hinged on one side

2. a window containing frames hinged at the side or at the top or bottom

3. a poetic word for window

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Casement ² British  

/ ˈkeɪsmənt /

noun

1. Sir Roger ( David ). 1864–1916, British diplomat and Irish nationalist: hanged by the British for treason in attempting to gain German support for Irish independence

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Other Word Forms

• casemented
  adjective

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Etymology

Origin of casement

1375–1425; late Middle English. See case ², -ment

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Explanation

A casement is a type of window that swings open on a hinge, like a door. Open the casements in the kitchen and let the breeze come in! Before the invention of the sash window, which slides up and down, casements were very common. Today, you're more likely to see casement windows in European homes than in the U.S. Extremely old houses, especially those built before the 17th century, commonly have casement windows with leaded glass panes. Experts guess that the word casement comes from the Old French enchassement, "window frame."

Example Sentences

See Examples For:

casement Casement

Steel casement windows and oversize doors used throughout the house are salvaged.

From Los Angeles Times ● Oct. 6, 2026

It also comes complete with two staircases, window seats, and casement windows.

From MarketWatch ● Jun. 26, 2026

Just imagine a Tudor without its steel casement windows or a Craftsman without its solid built-in bookcases.

From Seattle Times ● Jul. 25, 2023

The casement windows on the second floor were probably added in the 1920s — casement windows became popular then — and those very large ground-floor picture windows came later.

From New York Times ● Nov. 21, 2022

In fact, at the same time that her moth was perched in the window casement watching sleep claim Lazlo Strange, Sarai was watching it not claim the Godslayer.

From "Strange the Dreamer" by Laini Taylor

Returning on a German U-boat to County Kerry in April 1916, Casement was intercepted and arrested by British authorities.

From BBC ● Oct. 22, 2026

Association chairperson Alan Daly said: "After many months of preparation, we have formally applied for the exhumation of Roger Casement to bring him home."

From BBC ● Oct. 22, 2026

Other flagship policies including the redevelopment of Casement Park and the A5 road project also remain mothballed due to financial and legal disputes.

From BBC ● Sep. 6, 2026

As for his government's record on support for sport in Northern Ireland, £50m was made available towards the long-awaited redevelopment of Casement Park in June 2025.

From BBC ● Jul. 20, 2026

But in no case will 275 it be used except in such ways as Sir Roger Casement shall approve, as being completely in accordance with Article 2.

From The Moonlit Way by Robert W. (Robert William) Chambers

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