Definition of "window" []

• An opening constructed in a wall or roof that functions to admit light or air to an enclosure and is often framed and spanned with glass mounted to permit opening and closing. (noun)
• A framework enclosing a pane of glass for such an opening; a sash. (noun)
• A pane of glass or similar material enclosed in such a framework. (noun)
• An opening that resembles a window in function or appearance. (noun)
• The transparent panel on a window envelope. (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.

• "The window is called _La frineste deüs caperas_ (_the priests 'window_)."
• "The main window is smashed to pieces, the furniture overturned, and the kitchen looks like some kind of last stand has been waged there."
• "The term window as applied to the GUI of an OS dates atleast as far back as Xerox/PARC."