Jump To:

• 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.

---

Casement ² American  

[kays-muhnt] / ˈkeɪs mənt /

noun

1. (Sir) Roger (David), 1864–1916, Irish patriot: hanged by the British for treason.

---

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

---

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

---

Other Word Forms

• casemented
  adjective

Etymology

Origin of casement

1375–1425; late Middle English. See case ², -ment

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

Stained-glass casement windows the color of the Balearic Sea — which Fournier and Marty first used at their new Musée Yves Saint Laurent in Marrakesh — offer views of the neighborhood below.

From New York Times ● Sep. 14, 2018

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

From "Orphan Train" by Christina Baker Kline

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

From BBC ● Jul. 3, 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

"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

The executive had previously committed £62m towards the construction of Casement Park.

From BBC ● Jan. 6, 2026

I saw a poster on the side of a 'bus this afternoon, advertising 'The Magic Casement.'

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