[ˈwɪndəʊ], (Noun)

Definitions:
- an opening in the wall or roof of a building or vehicle, fitted with glass in a frame to admit light or air and allow people to see out

- a transparent panel on an envelope to show an address

- a framed area on a display screen for viewing information

- an interval or opportunity for action
(e.g: the parliamentary recess offers a good window for a bid)

- a range of electromagnetic wavelengths for which a medium (especially the atmosphere) is transparent

- strips of metal foil dispersed in the air to obstruct radar detection


Phrases:
- go out the window
- the windows of the soul
- window of opportunity
- window of vulnerability

Origin:
Middle English: from Old Norse vindauga, from vindr ‘wind’ + auga ‘eye’