window

noun

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. an opening that resembles a window in appearance or function"he could see them through a window in the trees"
5. the time period that is considered best for starting or finishing something"the expanded window will give us time to catch the thieves"
6. a pane of glass in a window"the ball shattered the window"
7. an opening in a wall or screen that admits light and air and through which customers can be served"he stuck his head in the window"
8. (computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen