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

This is followed by a new moon in the same sign on May 26, fueling the fire and desire to express yourself, whether through hobbies, love or play. —Staff Author, People.com, 1 May 2025

Mercury enters Gemini on May 25th, and the Gemini new moon on May 26th is your social reset button. —Dossé-Via Trenou, Refinery29, 29 Apr. 2025

Plan your visit around a new moon, when there will be less light in the night sky. —Evie Carrick, Travel + Leisure, 28 Apr. 2025

Now, the researchers are tasked with naming the 128 new moons. —Margherita Bassi, Smithsonian Magazine, 12 Mar. 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