full moon


Definition of full moon

: the moon with its whole apparent disk illuminated

Examples of full moon in a Sentence

Recent Examples on the Web Last year, backyard stargazers were treated to a surprise guest in Comet NEOWISE and a full moon lit up Halloween night. Dean Regas, USA TODAY, "Lunar eclipses, meteor showers: Look out for these astronomical highlights coming in 2021," 31 Dec. 2020 This year doesn’t look promising, as a full moon will drown out most of the display. oregonlive, "Stargazing calendar 2021: Eclipses, meteor showers and other astronomical events this year," 30 Dec. 2020 Halloween is the year’s spookiest holiday, especially today, when a full moon will shine. Richard Lederer, San Diego Union-Tribune, "Celebrating a century of Halloween in America," 31 Oct. 2020 Halloween, a daylight saving time change and a full moon all align on a singular night. Ryan Prior, CNN, "This weekend is nuts. Halloween, full moon, time change and just before the election. How do we cope?," 29 Oct. 2020 Little ghouls and goblins heading out on this spooky Halloween Night will get a creepy bonus: a full moon rising about a half hour after sunset. National Geographic, "Will every hurricane season be like this?," 28 Oct. 2020 Falling on a Saturday with a full moon shining overhead, Halloween this year was setting up to be special. Katie V. Jones, baltimoresun.com, "Scavenger hunts and spooky films: How to have a fun yet safe Halloween in Laurel amid pandemic," 14 Oct. 2020 And, when that full moon is, quite literally, a blue moon, the excitement only increases. Rebecca Norris, Country Living, "This Halloween Is About to Be Even Spookier Than Usual Thanks to a Rare Blue Moon," 14 Aug. 2020 As always, try and find a spot away from light pollution to get the best glimpse of the full moon. Isabel Garcia, House Beautiful, "Here's Everything You Need to Know About January's Full Wolf Moon," 11 Jan. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'full 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 full moon

before the 12th century, in the meaning defined above

Keep scrolling for more

Learn More about full moon

Time Traveler for full moon

Time Traveler

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

See more words from the same century

Statistics for full moon

Last Updated

24 Feb 2021

Cite this Entry

“Full moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/full%20moon. Accessed 2 Mar. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for full moon

full moon


English Language Learners Definition of full moon

: the moon when it appears as a bright circle

full moon


Kids Definition of full moon

: the moon with its whole disk lighted

Comments on full moon

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


Test Your Vocabulary

February 2021 Words of the Day Quiz

  • squirrel in winter
  • Which is a synonym of perdure?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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