Definition of windowing:
(n) :
(computing) The use of a graphical user interface divided into windows.
(n) :
(film) The scheduling of the exhibition and distribution of a film, involving for example a period of theatrical showings before release on home media.
(n) :
(signal processing) The multiplication of a signal by a window function, restricting the signal to a specific time segment.
(n) :
The windows of a building; fenestration.