window (Noun) — A framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air.
window (Noun) — A transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened.
window (Noun) — A transparent panel (as of an envelope) inserted in an otherwise opaque material.
window (Noun) — An opening that resembles a window in appearance or function. ex. "he could see them through a window in the trees"
window (Noun) — The time period that is considered best for starting or finishing something. ex. "the expanded window will give us time to catch the thieves" ex. "they had a window of less than an hour when an attack would have succeeded"
window (Noun) — A pane of glass in a window. ex. "the ball shattered the window"
window (Noun) — An opening in a wall or screen that admits light and air and through which customers can be served. ex. "he stuck his head in the window"
window (Noun) — (computing) a rectangular part of a computer screen that contains a display different from the rest of the screen.