window
noun
[ ˈwɪndəʊ ]
• 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.
• "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.
Origin:
Middle English: from Old Norse vindauga, from vindr ‘wind’ + auga ‘eye’.