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UK [ˈwɪndəʊ] / US [ˈwɪndoʊ] noun [countable]
Word forms "window":
singular window plural windows

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?

a) a similar frame in a vehicle

a car with electric windows

b) a similar frame in a shop, used especially for showing goods to the public

What size are those shoes in the window?

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) a part of some envelopes that you can see through in order to read the address printed on the letter

4) a period of time when you can do something

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

•

out (of) the window — informal used for saying that you stop doing something or stop using something completely

It's important not just to throw reason out the window.

When money is mentioned, principles go out of the window.

a window on/onto/into something — something that shows you what something else is really like

Is the play an accurate window on the world?

This traditional art form provides a fascinating window into another culture.

See:

window of opportunity