an opening in the wall or roof of a building, car, etc., usually covered with glass, that allows light and air to come in and people to see out; the glass in a window

the glass at the front of a shop and the area behind it where goods are shown to the public

I saw the dress I wanted in the window.

a small area of something that you can see through, for example to talk to somebody or read something on the other side

There was a long line of people at the box-office window.

We tapped on the window to get their attention.

The address must be clearly visible through the window of the envelope.

an area within a frame on a computer screen, in which a particular program is operating or in which information of a particular type is shown

a way of seeing and learning about something

Television is a sort of window on the world.

It gave me an intriguing window into the way people live.

a time when there is an opportunity to do something, although it may not last long

We now have a small window of opportunity in which to make our views known.

LEARNit Dictionary