∙ An opening, usually covered by one or more panes of clear glass, to allow light and air from outside to enter a building or vehicle.
∙ An opening, usually covered by glass, in a shop which allows people to view the shop and its products from outside; a shop window.
∙ The shutter, casement, sash with its fittings, or other framework, which closes a window opening. architecture
∙ A period of time when something is available.
∙ A rectangular area on a computer terminal or screen containing some kind of user interface, displaying the output of and allowing input for one of a number of simultaneously running computer processes. graphical user interface
∙ A figure formed of lines crossing each other.
∙ The time between first infection and detectability. medicine