Definition of moon noun from the Oxford Advanced American Dictionary

      

    moon

     noun
    noun
    NAmE//mun//
     
     
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  1. 1the moon, 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
  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?
  4. Idioms
    ask, cry, etc. for the moon(informal)
     
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    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.
    many moons ago(literary)
     
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    a very long time ago All that happened many moons ago.
    once in a blue moon(informal)
     
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    very rarely
    promise (somebody) the earth/moon/world(informal)
     
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    to make promises that will be impossible to keep Politicians promise the earth before an election, but things are different afterward.
See the Oxford Advanced Learner's Dictionary entry: moon