noun
- an opening in the wall of a building, the side of a vehicle, etc., for the admission of air or light, or both, commonly fitted with a frame in which are set movable sashes containing panes of glass.
- such an opening with the frame, sashes, and panes of glass, or any other device, by which it is closed.
- the frame, sashes, and panes of glass, or the like, intended to fit such an opening: Finally the builders put in the windows.
- a windowpane.
- anything likened to a window in appearance or function, as a transparent section in an envelope, displaying the address.
- a period of time regarded as highly favorable for initiating or completing something: Investors have a window of perhaps six months before interest rates rise.
- Military. chaff1(def 5).
- Geology. fenster.
- Pharmacology. the drug dosage range that results in a therapeutic effect, a lower dose being insufficient and a higher dose being toxic.
- Aerospace.
- launch window.
- a specific area at the outer limits of the earth’s atmosphere through which a spacecraft must reenter to arrive safely at its planned destination.
- Computers. a section of a display screen that can be created for viewing information from another part of a file or from another file: The split screen feature enables a user to create two or more windows.