sky - definition and synonyms

noun [countable/uncountable] 

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  1. the space above the earth that you see when you look up into the air

    At noon the sun is directly above us in the sky.

    Air pollution is clearly visible in the skies over the city.

    a clear blue sky

    the night/summer/northern sky (=how the sky looks at a particular time, season, or place):

    The night sky was filled with stars.

    a patch/strip of sky (=a small area of the sky):

    a patch of blue sky among the clouds

    1. a.
      [usually plural] used for talking about the weather
      clear/cloudy skies:

      Tomorrow we expect clear skies in the morning, with rain in the afternoon.