(Britain, slang, offensive) A mentally handicapped person.

A period of time in which suitable action can achieve success.

(management) Describing a service operation at which all of a customer's needs may be satisfied by a single server, without waiting in a second queue.

plural of window frame

(interior decoration, chiefly US, Canada) A set of decorations for a window, often including curtains or blinds.

plural of window treatment

(graphical user interface) A window often with miniaturized graphical user interface widgets housing a collection of related tools/commands for a particular task. The contemporary behavior is for the window to be a floating palette, floating over the main document window.

plural of window seat

(architecture) A window consisting of two sliding panels (sashes).

A window enabling a prison guard to see into a cell without being seen by the prisoner.