new moon

noun

Definition of new moon

1 :the moon's phase when it is in conjunction with the sun so that its dark side is toward the earth; also :the thin crescent moon seen shortly after sunset for a few days after the actual occurrence of the new moon phase
2 :the first day of each Jewish month marked by a special liturgy

First Known Use of new moon

before 12th century


NEW MOON Defined for English Language Learners

new moon

noun

Definition of new moon for English Language Learners

  • : the moon when it is completely dark


NEW MOON Defined for Kids

new moon

noun

Definition of new moon for Students

1 :the moon's phase when its dark side is toward the earth
2 :the thin curved outline of the moon seen shortly after sunset for a few days after the new moon


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