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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

The stylistic overhaul replicated original details such as period moldings and added new flair as well, including French casement windows and white oak herringbone floors.

From Los Angeles Times ● Feb. 29, 2020

She turns her head and there, through a casement window, is the bay.

From "Orphan Train" by Christina Baker Kline

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

From BBC ● Oct. 22, 2026

An application has been lodged to have the remains of a knight of the realm turned Easter Rising conspirator, Sir Roger Casement, moved to Northern Ireland.

From BBC ● Oct. 22, 2026

On Thursday night, the association and McCarry gathered at the Casement Social Club in Belfast alongside their legal team, Phoenix Law solicitors, and O'Neill's Funeral Directors.

From BBC ● Oct. 22, 2026

Those unfamiliar with the life and times of Roger Casement might still recognise his name from the sports stadium at the heart of one of Northern Ireland's most enduring modern political rows - Casement Park.

From BBC ● Oct. 22, 2026

Mrs. Graham and Mary and Rachel Wynne dined with them on the first night of "The Magic Casement."

From Changing Winds A Novel by St. John G. (St. John Greer) Ervine

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