noun The atmosphere above a given point, especially as visible from the surface of the Earth as the place where the sun, moon, stars, and clouds are seen.
That year, a meteor fell from the sky.
noun With a descriptive word: the part of the sky which can be seen from a specific place or at a specific time; its climate, condition, etc.
I lay back under a warm Texas sky.
noun Usually preceded by the: the abode of God or the gods, angels, the souls of deceased people, etc.; heaven; also, powers emanating from heaven.
This mortal has incurred the wrath of the skies.
noun Ellipsis of sky blue.
noun The set of all lightlike lines (or directions) passing through a given point in space-time.
noun In an art gallery: the upper rows of pictures that cannot easily be seen; also, the place where such pictures are hung.
noun A cloud. .mw-parser-output .defdate{font-size:smaller}