Definition of casement in English:

Share this entry


Pronunciation: /ˈkeɪsm(ə)nt/


1A window or part of a window set on a vertical hinge so that it opens like a door.
Example sentences
  • A casement window works like a door, with hinges on one side and the lock and handle on the other.
  • Leaded casement windows opened on to the tiny plaza in front of the cathedral and a breeze billowed tapestry-like curtains in the bedroom and sitting rooms.
  • The new room measures only 12x13 feet but feels far more spacious thanks to a large casement window and sliding glass doors that open onto a new deck.
1.1 literary A window of any kind.
Example sentences
  • She never really noticed much even though that large casement exposed the contents of the store like the box of a toy with the cellophane window.
  • The stained-glass insert in the astronomer's casement is the one minor detail that differentiates the two hourglass windows.
1.2The sash of a sash window.
Example sentences
  • Instead, he preferred casement sashes, which he placed in strips, one after the other.


Late Middle English (as an architectural term denoting a hollow moulding): from Anglo-Latin cassimentum, from cassa, from Latin capsa (see case2).

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.