A window sash that opens outward by means of hinges.(noun)
A window with such sashes.(noun)
A case or covering.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "casement" in a sentence
"To express it in the same idle imagery it would be the fact that even a casement is a part of a house, as a kettle is a part of a household."
"Looking through the casement was the visage of the mariner, no longer stern, but moved with unutterable emotion, and tears, yes, tears trickling down his weather-beaten cheeks."
"` Drop the Bible into the room, 'for I had seen that the casement was a little open."