an opening in an otherwise solid, opaque surface, through which light can pass.

an opening in a wall, door, roof or vehicle that allows the passage of light and, if not closed or sealed, air and sound.

an opening in the wall or roof of a building or vehicle that is fitted with glass or other transparent material in a frame to admit light or air and allow people to see out.

an interval or opportunity for action.

an opening in a wall, door, etc., that usually contains a sheet of glass.

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.

an opening (as a shutter, slot, or valve) that resembles or suggests a window.

any of various rectangular boxes appearing on a computer screen that display files or program output, that can usually be moved and resized, and that facilitate multitasking.

The window is a constant subject in the history of photography both literally and figuratively. Light can pass through a window and/or be reflected off of it. A window can separate two spaces in three dimensions or combine them in two dimensions (image). It can frame a view or obscure it entirely. A window is a photographic cliche. The window is a viewfinder to the world and a picture of a window is a picture of photography itself.