window - definition and synonyms

noun [countable] 

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  1. 1
    a frame in a wall with glass in it that lets light and air into a room and lets you see what is outside

    She just stood there staring out of the window.

    Through the window he saw a figure coming up the path.

    She was watching him from an upstairs window.

    open/close a window:

    Do you mind if I open a window?

  2. 2
    computing one of the different work areas on a computer screen
    open/close a window:

    Click on the X to close the window.

  3. 3
    a part of some envelopes that you can see through in order to read the address printed on the letter
  4. 4
    a period of time when you can do something

    I’ve got a window on Friday when I could see you.