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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

I carried the largest piece of the rocket, a center section of the casement, to Mr. Caton.

From "October Sky" by Homer Hickam

In 1911, Casement was knighted by King George V for his humanitarian work - which took him from central Africa to some of the poorest parts of South America.

From BBC ● Oct. 22, 2026

On 29 June 1916 Casement was found guilty of high treason and sentenced to death.

From BBC ● Oct. 22, 2026

As Pádraig Pearse read the proclamation on the steps of the Dublin's General Post Office, Casement was locked in the Tower of London awaiting trial for treason.

From BBC ● Oct. 22, 2026

If successful, it would be the second time Casement will have been exhumed and reburied.

From BBC ● Oct. 22, 2026

There are British consuls like Casement, Thesiger, Mitchell and Armstrong, all writing in their official capacity with every detail of fact and date.

From The Crime of the Congo by Sir Arthur Conan Doyle

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