window

An opening constructed in a wall, door, or roof that functions to admit light or air to an enclosure and is often framed and spanned with glass mounted to permit opening and closing.

A framework enclosing a pane of glass for such an opening; a sash.

A pane of glass or similar material enclosed in such a framework.

An opening or transparent part that resembles a window in function or appearance.

The transparent panel on a window envelope.

The area or space immediately behind a window, especially at the front of a shop.

A means of access or observation.

An interval of time during which an activity can or must take place.