noun

1. 1. an opening in a building, vehicle, or container, for letting in light or air or for looking through, usually having a pane or panes of glass, etc. set in a frame or sash that is generally movable so that it can be opened and shut
   2. any of these panes, or the sash or sashes in their casement
2. 1. any similar opening, as that before a bank teller
   2. an opening, period of time, etc. for access window of opportunity
3. the transparent panel of a window envelope
4. 1. any device put into the atmosphere to yield a perceptible radar echo, usually used for tracking an airborne object or as a tracer of wind
   2. chaff ()
5. launch window
6. any portion of the frequency spectrum of the earth's atmosphere through which light, heat, or radio waves can penetrate to the earth's surface due to the low absorption or dissipation of electromagnetic energy in this particular portion
7. Comput. any of the separate data displays appearing simultaneously on a single video screen in certain systems

Etymology: ME windoge < ON vindauga, window, lit., wind eye < vindr, wind + auga, an eye; akin to Ger auge, eye

transitive verb