a light framework, made of timber, metal, or plastic, that contains glass or glazed opening frames and is placed in a wall or roof to let in light or air or to see through
▶ Related adjective: fenestral
2.
an opening in the wall or roof of a building that is provided to let in light or airor to see through
3. windowpane
4.
the display space in and directly behind a shop window
the dress in the window
5.
any opening or structure resembling a window in function or appearance, such as the transparent area of an envelope revealing an address within
6.
an opportunity to see or understand something usually unseen
a window on the workings of Parliament
7.
a period of unbooked time in a diary, schedule, etc
8. short for launch window, weather window
9. physics
a region of the spectrum in which a medium transmits electromagnetic radiation
See also radio window
10. computing
an area of a VDU display that may be manipulated separately from the rest of the display area; typically different files can be displayed simultaneously in different overlapping windows