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English definition of “new moon”

new moon

noun [C usually singular, U] uk   us  
the moon when it is shaped like a crescent, or a time when it is shaped like this: It was dark now and the sliver of a new moon could be seen overhead. The team discovered that the planet is 0.02°C warmer at full moon than at new moon.
(Definition of new moon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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