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’s also a new moon in Libra on October 10, as though to drive the point home that every death is actually a birth. — Steph Koyfman, Condé Nast Traveler, 28 Sep. 2026

Full and new moons pull the ocean into its highest tides of the month. — Rebekah Riess, CNN Money, 26 Sep. 2026

There was a new moon, a thin crescent of pale light, shining softly in the sky. — Literary Hub, 15 Sep. 2026

The moonphase, at 6 o’clock, appears in a fully visible enamel disk rather than the half-aperture of the 8171, with both the full and new moons rendered in meteorite—the latter with a dark PVD coating. — Carol Besler, Robb Report, 15 Sep. 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