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

an opening that resembles a window in appearance or function

an opening in a wall or screen that admits light and air and through which customers can be served

the time period that is considered best for starting or finishing something

a space behind the window of a shop or the glass at the front of a shop where goods are shown to the public