- 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.
- The shutter, casement, sash with its fittings, or other framework, which closes a window opening.
- A figure formed of lines crossing each other.
- To furnish with windows.
- To place at or in a window.