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

There will be several events across the region where the public can stargaze and celebrate the night skies, and this year’s celebration coincides with a meteor shower and a new moon. —Carlos Rico, San Diego Union-Tribune, 8 Apr. 2026

There will be a new moon in your sign on April 17, which is essentially a reset button that encourages you to start again, in a bold new way. —Valerie Mesa, PEOPLE, 1 Apr. 2026

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

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