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

Then, next year, NASA plans for astronauts to rendezvous and dock in low-Earth orbit with new moon landers being built by SpaceX and Blue Origin to test critical systems and verify operating procedures. —William Harwood, CBS News, 30 Mar. 2026

With Mercury, Mars, the Sun, Saturn, and Neptune all moving through Aries this month, along with a new moon in your sign on April 17, the focus shifts decisively to your body, your appearance, and your desires. —Kirah Tabourn, Condé Nast Traveler, 28 Mar. 2026

The Pisces new moon rewrites your routines. —Usa Today, USA Today, 18 Mar. 2026

Huang and his co-authors are especially eager for higher-resolution images of the region to better characterize its geology and gauge how well astronauts could navigate its terrain—something that could come from a new moon-mapping satellite that China announced last year. —Lee Billings, Scientific American, 10 Mar. 2026

Word History

First Known Use

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

Rhymes for new moon

• attune
• baboon
• balloon
• bassoon
• buffoon
• cartoon
• cocoon
• festoon
• gaboon
• harpoon
• immune
• impugn

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