What is the meaning of 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.
• 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.
  • usage: "he could see them through a window in the trees"
• The time period that is considered best for starting or finishing something.
  • usage: "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"
• A pane of glass in a window.
  • usage: "the ball shattered the window"
  • synonyms: windowpane
• An opening in a wall or screen that admits light and air and through which customers can be served.
  • usage: "he stuck his head in the window"
• Computer science. ( a rectangular part of a computer screen that contains a display different from the rest of the screen).