window

window /ˈwɪndoʊ/ noun
plural windows
window
/ˈwɪndoʊ/
noun
plural windows
Britannica Dictionary definition of WINDOW
1 
[count]
a  : an opening in a wall, door, etc., that usually contains a sheet of glass
— see also bay window, french window, picture window, rose window, storm window
b  : a sheet of glass that covers an opening in a building, vehicle, etc.
c  : a large window at the front of a store where goods are displayed so that they can be seen by people who are walking past
d  : an opening in a wall through which business is conducted
2 
[count] : a part of something that you can see through
3 
[count] : an area or box on a computer screen that shows a program that is currently running
— see picture at computer
4 
[singular] : a period of time during which something can happen

a window into/on

: something that makes it possible to see or understand something clearly

go out the window

informal
: to stop being used or thought about

throw (something) out the window

informal
: to stop using or thinking about (something)