moon

noun
\ˈmün \

Definition of moon 

(Entry 1 of 2)

1a often capitalized : the earth's natural satellite (see satellite sense 2a) that shines by the sun's reflected light, revolves about the earth from west to east in about 29¹/₂ days with reference to the sun or about 27¹/₃ days with reference to the stars, and has a diameter of 2160 miles (3475 kilometers), a mean distance from the earth of about 238,900 miles (384,400 kilometers), and a mass about one eightieth that of the earth usually used with the

b : one complete moon cycle consisting of four phases (see phase entry 1 sense 1)

c : satellite sense 2 specifically : a natural satellite of a planet the moons of Jupiter

2 : an indefinite usually extended period of time a labor of many moons

3 : moonlight keep out of the moon or it may turn your head— H. R. Haggard

4 : something that resembles a moon: such as

a : a highly translucent (see translucent sense 1) spot on old porcelain

b : lunule

c slang : naked buttocks

5 : something impossible or inaccessible reach for the moon

over the moon

: very pleased : in high spirits

moon

verb
mooned; mooning; moons

Definition of moon (Entry 2 of 2)

transitive verb

1 : to spend in idle reverie : dream used with away mooned the afternoon away

2 slang : to expose one's naked buttocks to One of the boys mooned the crowd.

intransitive verb

: to spend time in idle reverie : behave abstractedly fans mooning over movie stars

Keep scrolling for more

Other Words from moon

Noun

moonlike \-ˌlīk \ adjective

Synonyms for moon

Synonyms: Noun

aeon (or eon), age, blue moon, cycle, eternity, forever, long, months

Visit the Thesaurus for More 

Examples of moon in a Sentence

Noun

The telescope makes the craters on the surface of the moon incredibly clear. the orbit of the Moon around the Earth Europa and Io are both moons of Jupiter. a planet orbited by one moon

Verb

One of the boys mooned the crowd. One of the boys mooned at the crowd.
See More

Recent Examples on the Web: Noun

This will be the smallest spacecraft to land on the moon to date. Israel Kasnett, Jewish Journal, "Israel gets set to land spacecraft on the moon," 11 July 2018 Soak in the view or meander down to the crescent-moon shaped beach and chill. Gregory Thomas, SFChronicle.com, "One Day, One Place: Half Moon Bay harbor," 11 July 2018 Israel joined the competition set on joining the ranks of the United States, Russia and China in reaching the moon. Lilly Price, USA TODAY, "Israel plans mission to the moon using smallest spacecraft to ever make the journey," 11 July 2018 Returning are many of the crowd favorites, including fishing in the fountain, face painting, hair spraying, and moon bouncing. Steve Smith, Courant Community, "Kidding Around The Center Set For July 17," 10 July 2018 Upon landing, the craft will relay photographs and collect data about the moon’s magnetism for research by Israel’s Weizmann Institute. Washington Post, "Israeli company plans lunar landing next year," 10 July 2018 Donald got into an argument with the moon and died instantly. Lisa Miller, The Cut, "The Weaponized Amber Tamblyn," 8 July 2018 There is also a dual moon roof that covers much of the passenger area. G. Chambers Williams Iii, Houston Chronicle, "Toyota Sienna gets some upgrades for 2018, including new front end," 7 July 2018 One of these aspects was the unlikely existence of a large moon. The Economist, "Empty sky, empty Earth?," 5 July 2018

Recent Examples on the Web: Verb

The whole reason for mooning a group text in the first place. Madeline Buxton, refinery29.com, "Dear Apple, You Forgot Some Very Important "Do Not Disturb" Settings," 6 June 2018 She and Tom Arnold had mooned the crowd at a World Series game to show off their matching tattoos. Kate Stanhope, latimes.com, "Rocky road: Roseanne Barr's rollercoaster Hollywood ride," 10 Apr. 2018 These days any rocketeer wishing to get staggeringly pie-eyed and maybe moon the Moon will have to hitch a ride with another space agency altogether. David Arky, Smithsonian, "How Do You Make Beer in Space?," 20 Mar. 2018 Who can forget Ilie Nastase pulling down his pants and mooning the chair umpire Charles Hare in Palm Springs in 1976? Cindy Shmerler, New York Times, "Tennis Moves Toward Taking the Human Element Out of Line Calls," 1 Mar. 2018 The old Birmingham guard repaid the favor by using the worlds' largest cast iron statue to perpetually moon the little town that preferred seeking its own stars. Birmingham Magazine, AL.com, "A History of Homewood," 19 Feb. 2018 Until Sunday the biggest threat was guests occasionally mooning or flashing partygoers, says DJ cb shaw, who was a resident DJ at Rehab for six years. Alexei Barrionuevo, Billboard, "Dance Music Industry Says Pool Parties Could Be Vulnerable Following Las Vegas Shooting," 5 Oct. 2017 Having washed up on the Illyrian shore as a stranger in a strange land, Viola has been dispatched to sing the love of her new employer: the lovesick Duke Orsino (Demetrios E. Troy), mooning over Countess Olivia (Deborah Staples). Mike Fischer, Milwaukee Journal Sentinel, "Elyse Edelman brings new dimension to Door Shakespeare's 'Twelfth Night'," 17 July 2017 Among the actions that remain banned are those depicting a weapon or aimed at embarrassing opponents like Randy Moss pretending to moon the fans at Lambeau Field or Terrell Owens... Michael Salfino, WSJ, "The NFL’s New Touchdown Rules Could Endanger the Lambeau Leap," 24 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'moon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of moon

Noun

before the 12th century, in the meaning defined at sense 1a

Verb

1836, in the meaning defined at transitive sense 1

History and Etymology for moon

Noun

Middle English mone, from Old English mōna; akin to Old High German māno moon, Latin mensis month, Greek mēn month, mēnē moon

Verb

see moon entry 1

Keep scrolling for more

Learn More about moon

Dictionary Entries near moon

mooley

moolings

moolvee

moon

moon's man

moon after

moonal

Statistics for moon

Last Updated

8 Oct 2018

Look-up Popularity

Time Traveler for moon

The first known use of moon was before the 12th century

See more words from the same century

Keep scrolling for more

More Definitions for moon

moon

noun

English Language Learners Definition of moon

 (Entry 1 of 2)

the moon : the large round object that circles the Earth and that shines at night by reflecting light from the sun

: a large round object like the moon that circles around a planet other than the Earth

moon

verb

English Language Learners Definition of moon (Entry 2 of 2)

: to bend over and show your bare buttocks to someone as a rude joke or insult

moon

noun
\ˈmün \

Kids Definition of moon

 (Entry 1 of 2)

1 : the natural heavenly body that shines by reflecting light from the sun and revolves about the earth in about 29¹/₂ days

moon

verb
mooned; mooning

Kids Definition of moon (Entry 2 of 2)

moon

noun
\ˈmün \

Medical Definition of moon 

Keep scrolling for more

More from Merriam-Webster on moon

Thesaurus: All synonyms and antonyms for moon

Spanish Central: Translation of moon

Nglish: Translation of moon for Spanish Speakers

Britannica English: Translation of moon for Arabic Speakers

Comments on moon

What made you want to look up moon? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

lying above or upon

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!