1. An opening in the wall of a building for the admission of light and air, usually closed by casements or sashes containing some transparent material, as glass, and capable of being opened and shut at pleasure. I leaped from the window of the citadel. (Shak) Then to come, in spite of sorrow, And at my window bid good morrow. (milton)
3. A figure formed of lines crossing each other. Till he has windows on his bread and butter. (king) french window, the common European martin. Window tax, a tax or duty formerly levied on all windows, or openings for light, above the number of eight in houses standing in cities or towns.
Origin: OE. Windowe, windoge, Icel. Vindauga window, properly, wind eye; akin to Dan. Vindue. See Wind, and Eye.