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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

"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

The impact bent the casement and shattered the wooden nose cone.

From "October Sky" by Homer Hickam

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

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

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

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

There arose some question concerning Sir Roger Casement.

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

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