a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air
a transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened
a transparent panel (as of an envelope) inserted in an otherwise opaque material
(computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen
an opening in the wall of a building (usually to admit light and air); "he stuck his head in the window"
an opening that resembles a window in appearance or function; "he could see them through a window in the trees"
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"