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English definition of “moon”

moon

noun     /muːn/
the moon [S] A2 the round object that moves in the sky around the Earth and can be seen at night: What time does the moon rise/set (= appear/disappear in the sky)?Astronomy - general words [S or U] the shape made by the amount of the moon that you can see at a particular time: There's no moon (= you cannot see the moon) tonight. a crescent/full/new moonAstronomy - general words [C] a similar round object that moves around another planet: Jupiter has at least 16 moons.Astronomy - general words
(Definition of moon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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