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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

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

From MarketWatch ● Jun. 26, 2026

"When it struck the quarters, the whole room shook and then the joy of somebody coming in, opening the casement, putting the rod in and winding it up," she said.

From BBC ● Feb. 20, 2022

“We added casement windows with screens so that it could be a four-season porch and we could enjoy it all year long,” said Baudoin.

From Seattle Times ● Jul. 6, 2021

Stained-glass casement windows the color of the Balearic Sea — which Fournier and Marty first used at their new Musée Yves Saint Laurent in Marrakesh — offer views of the neighborhood below.

From New York Times ● Sep. 14, 2018

Now and then, in passing a casement, you glanced out at the thick-falling snow; you listened to the sobbing wind, and again you paced gently on and dreamed.

From "Jane Eyre" by Charlotte Brontë

In a statement, the association said its plans have the support of Casement's family - namely James Casement from Arizona in the United States.

From BBC ● Oct. 22, 2026

He said "Casement always wanted to return home" and that it was "historic to be co-signing this application with Roger's direct and surviving relative, James Casement".

From BBC ● Oct. 22, 2026

And before being stripped of his knighthood at the end of his life, Casement had been both.

From BBC ● Oct. 22, 2026

With World War Two raging, Casement became attracted by the potential of an Irish-German alliance as a way of securing full Irish independence.

From BBC ● Oct. 22, 2026

For your information I enclose Zimmerman’s letter to Sir Roger, and also the text of Articles 6 and 7, being part of our first agreement with Sir Roger Casement.

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

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