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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

In the roughly 400-square-foot central living room, light pours through casement windows, revealing another series of signature elements.

From New York Times ● Feb. 18, 2020

It worked, and the slurry began to flow into the casement.

From "October Sky" by Homer Hickam

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

Money from the fund was also earmarked to go towards stalled projects like the A5 road and Casement Park stadium.

From BBC ● Feb. 1, 2026

"It's normal for teens to be night owls, so let them catch up on sleep on weekends if they can't get enough sleep during the week because that's likely to be somewhat protective," Casement said.

From Science Daily ● Jan. 7, 2026

"Instead of being a morning lark you're going to become more of a night owl," Casement explained.

From Science Daily ● Jan. 7, 2026

Casement windows were the earliest kind used, and the small, diamond panes were sunk in lead, as were those made in the mother country.

From Remodeled Farmhouses by Mary H. Northend

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