Simple Definition of window
: an opening in a wall, door, etc., that usually contains a sheet of glass
: a sheet of glass that covers an opening in a building, vehicle, etc.
: 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
Full Definition of window
1 a : an opening especially in the wall of a building for admission of light and air that is usually closed by casements or sashes containing transparent material (as glass) and capable of being opened and shut b : windowpane c : a space behind a window of a retail store containing displayed merchandise d : an opening in a partition or wall through which business is conducted <a bank teller's window>
2 : a means of entrance or access; especially : a means of obtaining information <a window on history>
3 : an opening (as a shutter, slot, or valve) that resembles or suggests a window
4 : the transparent panel or opening of a window envelope
5 : the framework (as a shutter or sash with its fittings) that closes a window opening
6 : chaff 4
7 : a range of wavelengths in the electromagnetic spectrum to which a planet's atmosphere is transparent
8 a : an interval of time within which a rocket or spacecraft must be launched to accomplish a particular mission b : an interval of time during which certain conditions or an opportunity exists <a window of vulnerability>
Examples of window
She opened a window to let in some air.
I looked out the window and saw a deer.
He used vinegar and water to wash the windows.
He accidentally broke a window.
Can you roll down the car window?
The windows along 5th Avenue were all decorated for Christmas.
I saw a beautiful dress in the window.
He sits behind a window and sells movie tickets.
Make sure the address shows through the window in the envelope.
A window opened in the fog and we could finally see the ocean.
Origin of window
Middle English windowe, from Old Norse vindauga, from vindr wind (akin to Old English wind) + auga eye; akin to Old English ēage eye — more at eye
First Known Use: 13th century
Medical Definition of window
1: fenestra 1
2: a small surgically created opening : fenestra 2a
3: a usually narrow interval of time or range of values for which a certain condition or an opportunity exists <coma and multiorgan failure can occur within hours and there may be a very narrow window of opportunity for transplantation—J. P. A. Lodge>—see therapeutic window
Seen and Heard
What made you want to look up window? Please tell us where you read or heard it (including the quote, if possible).