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

No eclipse is scheduled for this new moon, though – the next one is due on Sept. 21. —Jesse Emspak, Space.com, 25 June 2025

What to avoid around this new moon: Only lose yourself in dreams. —Danijela Pilic, Glamour, 24 June 2025

Fortunately, this could be the luckiest week of the year for you, along with a dazzling new moon in Cancer that could bring euphoric news, new beginnings and miraculous blessings to your life. —Kyle Thomas, People.com, 22 June 2025

The only moment of perfect syzygy during a new moon is a total solar eclipse. —Jamie Carter, Forbes.com, 27 Apr. 2025

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