Meaning

noun a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air

noun a transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened

noun a transparent panel (as of an envelope) inserted in an otherwise opaque material

originFrom Middle English wyndowe, wyndown, from Old Norse vindauga (“window”, literally “wind-eye; wind-hole”), equivalent to wind + eye. Cognate with Scots windae and windock, Faroese vindeyga, Norwegian Bokmål vindu, Norwegian Nynorsk vindauge, Danish vindue, archaic Swedish vindöga, Elfdalian windog. Displaced native Old English ēagþȳrel (literally “eye hole”) (the rare direct descendant is…

Etymology from Wiktionary, CC BY-SA 3.0