What is Window?
Window is (noun) 1. an opening in a surface such as a wall or door, which is filled with glass When I fly, I always ask for a seat by the window, so that I can watch the landing and takeoff. I looked out of the kitchen window and saw a fox. It’s dangerous to lean out of car windows. The burglar must have got in through the bathroom window. 2. a section of a computer screen used to display special information Open the command window to see the range of possible commands.
source: Easier English, Student Dictionary Upper Intermediate Level