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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

Just imagine a Tudor without its steel casement windows or a Craftsman without its solid built-in bookcases.

From Seattle Times ● Jul. 25, 2023

"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

Lai’s plan replaces windows and doors with black iron casement designs to let in more light, and installs bleached-oak flooring.

From Los Angeles Times ● May 17, 2018

Besides the countersunk nozzle, Mr. Caton showed off his new design for attaching the fins to the casement.

From "October Sky" by Homer Hickam

The GAA looks set to scale back its plans to redevelop Casement Park, BBC News NI understands.

From BBC ● Jul. 3, 2026

First Minister Michelle O'Neill had insisted Casement Park would be completed on her watch but not the stadium as originally planned.

From BBC ● Jul. 3, 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 makes that age range of particular interest in trying to understand risk factors for depression and how those might relate to delivery of interventions," Casement said.

From Science Daily ● Jan. 7, 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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