Meaning of “moon” in the English Dictionary

"moon" in British English

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uk /muːn/ us /muːn/
the moon [ S ]

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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)?

[ 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 moon

[ C ] a similar round object that moves around another planet:

Jupiter has at least 16 moons.

moonverb [ I or T ]

uk /muːn/ us /muːn/ informal

(Definition of “moon” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"moon" in American English

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moonnoun [ C/U ]

us /mun/

moon noun [ C/U ] (OBJECT IN SPACE)

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.

moon verb [ I always + adv/prep ] (LACK PURPOSE)

to move or spend time in a way that shows a lack of care and interest and no clear purpose:

She’s been mooning around the house all weekend.

(Definition of “moon” from the Cambridge Academic Content Dictionary © Cambridge University Press)