An opening in a wall or vehicle that lets in light and air, usually filled with glass. It can also mean a limited period of time when something is possible.
From Old Norse 'vindauga', literally 'wind-eye' ('vindr' for wind and 'auga' for eye). It replaced the Old English word 'ēagþyrel', meaning 'eye-hole.'
A window was once thought of as the building’s 'eye' where the wind looked in. The time meaning—'a window of opportunity'—keeps the idea of a brief opening you can see and move through.
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