any object resembling a moon
"he made a moon lamp that he used as a night light"
"the clock had a moon that showed various phases"
the period between successive new moons (29.531 days)
"The farmer calculated that there were exactly twenty-nine and a half days in the moon before planting began again."
United States religious leader (born in Korea) who founded the Unification Church in 1954; was found guilty of conspiracy to evade taxes (born in 1920)
"The prosecutor argued that the Moon's assets were transferred abroad specifically to evade federal taxes."
Any natural satellite of a planet.
"After studying astronomy, I learned that Jupiter has many moons orbiting around it."
In plain English: A moon is a natural satellite that orbits around a planet and often reflects sunlight.
"We watched the full moon rise over the quiet ocean at night."
Usage: Use "moon" to refer specifically to the Earth's natural satellite or any other planet's satellite when discussing astronomy or space exploration. Do not use it for the phases of the moon unless you are explicitly describing its changing appearance in the night sky.
be idle in a listless or dreamy way
"After spending hours staring blankly at his phone, he finally snapped out of it and realized he had been mooning around all afternoon."
To display one's buttocks to, typically as a jest, insult, or protest.
"After years of being ignored by her boss, she decided to moon him during the board meeting."
In plain English: To moon someone is to lift your buttocks into the air as an obscene gesture.
"The dog mooned at its reflection in the pond."
Usage: Use the verb moon to describe the act of turning around and displaying your rear end toward someone, usually as a playful prank, an insult, or a gesture of protest. This usage is informal and often implies a lack of shame in exposing oneself briefly for comedic effect.
Alternative letter-case form of Moon; the Earth's only permanent natural satellite.
"The bright light from the moon illuminated our walk home last night."
The Earth's moon; the sole natural satellite of the Earth, represented in astronomy and astrology by ☾.
The word "moon" comes from Old English and originally meant both the celestial body and the month. Its roots likely trace back to a Proto-Indo-European term for measuring time, suggesting an ancient connection between the moon's cycles and our calendar.