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
5. The time period that is considered best for starting or finishing something
6. A pane of glass in a window
7. An opening in a wall or screen that admits light and air and through which customers can be served
8. (computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen