A blue sky (sense 1).



  • 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.
  • 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.
  • Usually preceded by the: the abode of God or the gods, angels, the souls of deceased people, etc.; heaven; also, powers emanating from heaven.
  • The set of all lightlike lines (or directions) passing through a given point in space-time.
  • In an art gallery: the upper rows of pictures that cannot easily be seen; also, the place where such pictures are hung.
  • A cloud.


  • The noun is derived from Middle English ski, skie, sky, from Old Norse ský, from Proto-Germanic *skiwją, from *skiwô (whence Old English sċēo and Middle English skew), from Proto-Indo-European *(s)kewH-.
  • The verb is derived from the noun.
  • The English word is cognate with Old English scēo, Old Saxon scio, skio, skeo, Danish, Swedish and Norwegian Bokmål sky, Old Irish ceo, Irish ceo. It is also related to Old English scūa, Latin obscūrus, Sanskrit स्कुनाति. See also hide, hose, house, hut, shoe.

Modern English dictionary

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