Window \ˈwin-(ˌ)dō\
Etymology: Middle English windowe, from Old Norse vindauga,from vindr wind (akin to Old English wind) + auga eye; akin to Old English ēage eye
Date: 13th century
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>
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
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>
9: an area at the limits of the earth's sensible atmosphere through which a spacecraft must pass for successful reentry
