Definition of moon noun from the Oxford Advanced Learner's Dictionary

      

    moon

     noun
    noun
    BrE BrE//muːn//
     
    ; NAmE NAmE//muːn//
     
    The sun and the moon, The universe, Sky
     
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  1. 1  (also the moon) (also the Moon) [singular] the round object that moves around the earth once every 27½ days and shines at night by light reflected from the sun the surface of the moon a moon landing See related entries: The sun and the moon, Sky
  2. 2  [singular] the moon as it appears in the sky at a particular time a crescent moon There's no moon tonight (= no moon can be seen). By the light of the moon I could just make out shapes and outlines. see also full moon, half-moon, new moon
  3. 3[countable] a natural satellite that moves around a planet other than the earth How many moons does Jupiter have? See related entries: The universe
  4. Word Origin Old English mōna, of Germanic origin; related to Dutch maan and German Mond, also to month, from an Indo-European root shared by Latin mensis and Greek mēn ‘month’, and also Latin metiri ‘to measure’ (the moon being used to measure time).Extra examples A large black cloud covered the moon. During the eclipse, the moon passed between the sun and the Earth. Galileo discovered the moons of Jupiter. Saturn’s icy moons The agency wants to establish a permanent moon base. The calendar gives you sunset times as well as moon phases. The full moon hung high in the night sky. The moon cast its soft glow on the earth below. The moon had almost set and the night was now dark. The moon reflected perfectly off the surface of the water. The road shone frostily under the full moon. They had to work by the light of the moon. an astronaut who was killed during the first moon mission the first man to walk on the moonIdioms
    ask, cry, etc. for the moon
     
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    (informal) to ask for something that is difficult or impossible to get or achieve Wanting a decent job and a home is hardly asking for the moon.
    (literary) a very long time ago All that happened many moons ago. (informal) very rarely (informal, especially British English) extremely happy and excited They’re over the moon about their trip to Japan. See related entries: Excitement, Happiness
    promise (somebody) the earth/moon/world
     
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    (informal) to make promises that will be impossible to keep Politicians promise the earth before an election, but things are different afterwards.
See the Oxford Advanced American Dictionary entry: moon