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

Today’s new moon marks the beginning of a deeply personal lunar cycle centered around home, family and emotional stability. — Valerie Mesa, PEOPLE, 14 July 2026

Get real with your partner, and with yourself, under the Cancer new moon. — Usa Today, USA Today, 14 July 2026

In four-day periods every year from March to August, legions of small, silver fish called grunion ride the waves ashore for mating rituals, beginning on the nights of the full and new moons. — Los Angeles Times, 14 July 2026

This follows recent vivid auroras on July 3-4, and a new moon on July 14 will provide darker skies. — Jamie Carter, Forbes.com, 10 July 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