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• moon
  moon

  noun

  none the moon or the Moon the earth's natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2,160 miles (3,476 km).
• Moon
  Moon

  noun

  Sun Myung 1920–2012, Korean religious leader: founder of the Unification Church.

moon

¹ American  

[moon] / mun /

noun

• moons
  plural

1. none the moon or the Moon the earth's natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2,160 miles (3,476 km).

2. this body during a particular lunar month, or during a certain period of time, or at a certain point of time, regarded as a distinct object or entity.

3. a lunar month, or, in general, a month.

4. any planetary satellite.

   the moons of Jupiter.

5. something shaped like an orb or a crescent.

6. moonlight.

7. a platyfish.

8. Slang. the buttocks, especially when bared.

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verb (used without object)

• moons,
  present (3rd person singular)
• mooned,
  past participle,  past
• mooning
  present participle

1. to act or wander abstractedly or listlessly.

   You've been mooning about all day.

2. to sentimentalize or remember nostalgically.

   He spent the day mooning about his lost love.

3. to gaze dreamily or sentimentally at something or someone.

   They sat there mooning into each other's eyes.

4. Slang. to expose one's buttocks suddenly and publicly as a prank or gesture of disrespect.

verb (used with object)

• moons,
  present (3rd person singular)
• mooned,
  past participle,  past
• mooning
  present participle

1. to spend (time) idly.

   She mooned the afternoon away, unable to think what to do next.

2. to illuminate by or align against the moon.

3. Slang. to expose one's buttocks to as a prank or gesture of disrespect.

idioms

1. over the moon. see over the moon.

2. blue moon. see blue moon.

Moon ² American  

[moon] / mun /

noun

1. Sun Myung 1920–2012, Korean religious leader: founder of the Unification Church.

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Moon ¹ British  

/ muːn /

noun

1. a system of embossed alphabetical signs for blind readers, the fourteen basic characters of which can, by rotation, mimic most of the letters of the Roman alphabet, thereby making learning easier for those who learned to read before going blind Compare Braille 1

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moon ² British  

/ muːn /

noun

1. (sometimes capital) the natural satellite of the earth. Diameter: 3476 km; mass: 7.35 × 10 ²² kg; mean distance from earth: 384 400 km; periods of rotation and revolution: 27.32 days

2. the face of the moon as it is seen during its revolution around the earth, esp at one of its phases

   new moon

   full moon

3. any natural satellite of a planet

4. moonlight; moonshine

5. something resembling a moon

6. a month, esp a lunar one

7. very seldom

8. informal extremely happy; ecstatic

9. to desire or attempt something unattainable or difficult to obtain

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verb

1. to be idle in a listless way, as if in love, or to idle (time) away

2. slang (intr) to expose one's buttocks to passers-by

Moon ³ British  

/ muːn /

noun

1. William. 1818–94, British inventor of the Moon writing system in 1847, who, himself blind, taught blind children in Brighton and printed mainly religious works from stereotyped plates of his own designing

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moon Scientific  

/ mo̅o̅n /

1. Often Moon. The natural satellite of Earth, visible by reflection of sunlight and traveling around Earth in a slightly elliptical orbit at an average distance of about 381,600 km (237,000 mi). The Moon's average diameter is 3,480 km (2,160 mi), and its mass is about 1/80 that of Earth. Its average period of revolution around Earth is 29 days, 12 hours, 44 minutes.

2. See more at giant impact theory

3. A natural satellite revolving around a planet.

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moon Cultural  

1. A natural satellite of a planet; an object that revolves around a planet. The planets vary in the number of their moons; for example, Mercury and Venus have none, the Earth has one, and Jupiter has seventeen or more. The planets' moons, like the planets themselves, shine by reflected light.

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moon More Idioms  

1. see ask for the moon; once in a blue moon.

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Closer Look

The Earth's Moon is a desolate and quiet place. The only natural satellite of Earth, it consists almost entirely of rock, shows no signs of ongoing geologic activity, has no water, and has a very thin atmosphere consisting primarily of sodium. But our Moon does not present a typical case for planetary satellites. Over the last 50 years, over a hundred more moons have been discovered in the solar system, so that they now total 165, nearly all of them orbiting the larger planets Jupiter, Saturn, and Uranus (Mercury and Venus have no moon), with an additional four moons orbiting dwarf planets. Because they are so far from the Sun, these moons are for the most part extremely cold. Io, one of Jupiter's 63 known moons, is an exception. It is the most geologically active body in the solar system, with almost constant volcanic activity and a surface covered by cooling lava. Some scientists think that another moon of Jupiter, Europa, may have liquid water capable of supporting life underneath a thick layer of surface ice. Titan, one of Saturn's moons, may also be capable of supporting primitive life in the ocean of liquid methane on its frigid surface.

Discover More

The Earth's moon is about 240,000 miles away and is about 2,000 miles in diameter. The volume of the Earth is fifty times that of the moon; the mass of the Earth is about eighty times that of the moon. The moon has no atmosphere, and its gravity is about one-sixth that of the Earth.

Other Word Forms

Derived Forms

• mooner
  noun
• moonless
  adjective

Inflected Forms

Nouns

• moons
  plural

Participles

• mooning
  present
• mooned
  past

Conjugated Forms

Present

• moon
  simple
• moons
  simple
• have mooned
  perfect
• has mooned
  perfect
• am mooning
  progressive
• are mooning
  progressive
• is mooning
  progressive
• have been mooning
  perfect progressive
• has been mooning
  perfect progressive

Past

• mooned
  simple
• had mooned
  perfect
• was mooning
  progressive
• were mooning
  progressive
• had been mooning
  perfect progressive

Future

• will moon
  simple
• will have mooned
  perfect
• will be mooning
  progressive
• will have been mooning
  perfect progressive

Etymology

Origin of moon

First recorded before 900; Middle English mone, Old English mōna; cognate with Old High German māno, Old Norse māni, Gothic mena; akin to German Mond “moon,” Latin mēnsis “month,” Greek mḗnē “moon,” Sanskrit māsa “moon, month”

Explanation

Werewolves love to howl at a full moon. The moon is our planet’s satellite, and it rotates around the earth and reflects light from the sun. Also, “to moon” means to show your rear. The moon is out! Giggle giggle. The earth has just one moon, but the word moon can mean any natural satellite of any planet. Astronomers have discovered many moons — there are more than 160 in our solar system alone. Poets have been fascinated by the moon for a long time, and "to moon" also means "to act in a dreamy or aimless way." Our months are marked by changes in the moon's phase, and the Proto-Indo-European root means both "moon" and "month."

Example Sentences

See Examples For:

moon Moon moons mooned mooning

One workshop featured the creation of “mini moon bags,” modeled after pouches from the Soviet Hippie collection.

From Los Angeles Times ● Sep. 28, 2026

The collection was donated by private collector John Dulcamara and includes a piece of the command module from the 1969 Apollo 11 - the first manned mission to land on the moon.

From BBC ● Sep. 25, 2026

The rockets would be dedicated to refueling SpaceX’s massive Starship vehicles while in space, a critical step that could eventually enable more frequent trips to the moon and potentially Mars.

From The Wall Street Journal ● Sep. 24, 2026

As the moon travels around Uranus, gravitational forces repeatedly stretch and squeeze it, potentially placing enough stress on the surface to cause large fractures.

From Science Daily ● Sep. 24, 2026

“The Major’s got a friend, I’ve got a name, happy campers each and every, tickled pink, over the moon, five hops forward, no hops back, if you get my meaning.”

From "The Very, Very Far North" by Dan Bar-el

But immense technical challenges remain before Starship -- which Musk hopes to make fully reusable -- can be considered ready for commercial flights or to reach the Moon or Mars.

From Barron's ● Sep. 28, 2026

The findings could become especially important as space agencies prepare for longer missions to the Moon and eventually Mars.

From Science Daily ● Sep. 28, 2026

Wrapped in thick jackets, woollen caps and gloves, tourists and visitors gather to see the Milky Way and look through telescopes at planets, the Moon and distant stars.

From BBC ● Sep. 26, 2026

If you catch the Moon as it rises it may appear yellow, orange or even reddish.

From BBC ● Sep. 23, 2026

All at once, voices rose, reciting the Black Moon Song they’d known all their lives but were not allowed to sing aloud till this night.

From "Witchlings" by Claribel A. Ortega

As the young Solar System began assembling solid objects such as planets, moons, and protoplanets, two major types of material were available.

From Science Daily ● Sep. 23, 2026

Goth Shakira: It’s the full moon in Aquarius today, and full moons represent a culmination.

From Los Angeles Times ● Sep. 2, 2026

MMX is designed to study both Martian moons in detail and return samples from Phobos to Earth.

From Science Daily ● Aug. 26, 2026

The "capture" hypothesis meanwhile postulates that the moons are asteroids from the outer Solar System that were captured by Mars' gravity.

From Barron's ● Aug. 16, 2026

“Tortoises, mountains holding moons, and needles under the sea? I would not even pretend to understand what you are asking,” the king replied.

From "When the Sea Turned to Silver" by Grace Lin

While accepting the prize, Madonna reminisced about how her manager scolded her backstage at the very first MTV awards show, where she briefly mooned the audience in a performance fumble.

From Barron's ● Sep. 28, 2026

Perkins: What’s so great about this is seeing someone who looks like Lakeith being mooned after.

From Slate ● Nov. 20, 2019

She and Tom Arnold had mooned the crowd at a World Series game to show off their matching tattoos.

From Los Angeles Times ● Apr. 10, 2018

Buffy The Vampire Slayer and its spin-off, Angel, were cult classics, the just-home-from-school fantasy shows that made vampires sexy long before R-Patz and Kristen mooned at each other in Twilight.

From The Guardian ● Jun. 2, 2013

Almost disgusting, Rat said, the way they mooned over each other.

From "The Things They Carried" by Tim O'Brien

Bogotá’s unorthodox mayor, Antanas Mockus—who rose to fame after mooning student protesters and deployed mimes to control traffic—viewed the activity as a gambit “to achieve self-regulation in the behavior among citizens.”

From Slate ● Dec. 22, 2024

To say that “a computer understands” is like saying that your car is losing its sense of humor or mooning over an old girlfriend.

From Washington Post ● Apr. 24, 2023

Bad-boy drummer Tommy Lee, known for mooning the audience and for his marriage to Heather Locklear, is a key part of the band’s hardcore image.

From Los Angeles Times ● Feb. 2, 2022

Footage captured the moment a terminally ill man was arrested by police officers after "mooning" at speed camera van.

From BBC ● Nov. 10, 2021

“She’s going out with other guys and you’re still mooning over her?”

From "October Sky" by Homer Hickam