new moon

noun

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 beginning of each Jewish month marked by a special liturgy

Examples of new moon in a Sentence

Recent Examples on the Web
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This material would then re-form into some new moons — such as (possibly) Enceladus and the innermost ones within the rings — and the rings themselves. Big Think, 9 Oct. 2025 Supermoons happen when a new moon or a full moon is at its closest to Earth all month, according to NASA. Julia Gomez, USA Today, 7 Oct. 2025 Midmonth, Venus in Libra and a new moon bring emphasis to your friendship circles, reminding you how powerful your network can be. Valerie Mesa, PEOPLE, 1 Oct. 2025 Each partial solar eclipse takes place during the monthly new moon phase, when the lunar disk passes between Earth and sun, occulting (or hiding) its light while stopping short of perfectly blocking out its surface. Anthony Wood, Space.com, 21 Sep. 2025 See All Example Sentences for new moon

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1

Time Traveler
The first known use of new moon was before the 12th century

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Cite this Entry

“New moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/new%20moon. Accessed 18 Oct. 2025.

Kids Definition

new moon

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

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