(1)   A framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air
(2)   A transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened
(3)   A transparent panel (as of an envelope) inserted in an otherwise opaque material
(4)   (computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen
(5)   An opening in the wall of a building (usually to admit light and air)
"He stuck his head in the window"
(6)   A pane of glass in a window
"The ball shattered the window"
(7)   An opening that resembles a window in appearance or function
"He could see them through a window in the trees"
(8)   The time period that is considered best for starting or finishing something
"The expanded window will give us time to catch the thieves"
"They had a window of less than an hour when an attack would have succeeded"


From , combined from of and . The “windows” in these times were just unglazed holes (eyes) in the wall or roof that permitted wind to pass through.


  1. 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.
  2. An opening, usually covered by glass, in a shop which allows people to view the shop and its products from outside.
  3. A period of time when something is available.
    launch window; window of opportunity
  4. 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.