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English definition of “moon”

moon

noun [C/U] (OBJECT IN SPACE)   /mun/
the object, similar to a planet, that moves through the sky, circling the earth once every 28 days, and which can often be seen clearly at night when it shines with the light coming from the sun: [U] the full moon A moon is also a similar object that moves around another planet: [C] Jupiter has at least sixteen moons.
(Definition of moon noun (OBJECT IN SPACE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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