- An opening, usually covered by one or more panes of clear glass, to allow light and air from outside to enter a building or vehicle.
Etymology: From vindauga, combined from of vindr "windNoun, wind" and auga "eye". The "windows" in these times were just holes (eyes) in the wall that permitted wind to pass through.
- 1952: A window is an opening in a wall to admit light and air. — L.F. Salzman, Building in England, p. 173.
- An opening, usually covered by glass, in a shop which allows people to view the shop and its products from outside.
- A period of time when something is available.
- launch window
- window of opportunity
- A rectangular area on a computer terminal or screen containing some kind of user interface, displaying the output of and allowing input for one of a number of simultaneously running computer processes.
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Full Definition of window