full moon

noun

: the moon with its whole apparent disk illuminated

Examples of full moon in a Sentence

Recent Examples on the Web

The harvest moon is the full moon that is closest to the autumnal equinox. — Alexiah Syrai Olsen, Idaho Statesman, 3 Sep. 2026

Observing tips The September full moon is a perfect time to try your hand at astrophotography! — Anthony Wood, Space.com, 31 Aug. 2026

In one survey, Roman will cover an area equivalent to 3,455 full moons in about three weeks, then go back and observe a smaller portion of that area repeatedly over five-and-a-half days—jobs that Hubble and Webb can’t do. — Stephen Clark, ArsTechnica, 31 Aug. 2026

This will only continue to build until the full moon in Aries on September 26. — Steph Koyfman, Condé Nast Traveler, 30 Aug. 2026

Word History

First Known Use

before the 12th century, in the meaning defined above

Rhymes for full moon

• attune
• baboon
• balloon
• bassoon
• buffoon
• cartoon
• cocoon
• festoon
• gaboon
• harpoon
• immune
• impugn

Kids Definition

full moon

noun

: the moon with its whole disk lighted