means Glazed openings in a wall or vehicle that let in light and air while keeping the weather out — or, in computing, the rectangular framed regions an operating system uses to show separate programs or documents.

from From Old Norse 'vindauga,' literally 'wind-eye' — 'vindr' (wind) plus 'auga' (eye) — the early opening in a wall imagined as an eye through which the wind looked in. Norse settlers carried the word into English, where it displaced the older native term 'eye-thirl' (eye-hole). Notice the family resemblance: 'window' was once an eye, and we still speak of a window's 'eye' on the world. The computing sense — and the software brand — borrows the architectural idea of looking through a frame into another space.