le·​gion | \ ˈlē-jən How to pronounce legion (audio) \

Definition of legion

 (Entry 1 of 2)

1 : the principal unit of the Roman army comprising 3000 to 6000 foot soldiers with cavalry Caesar and his legions defeated the Gauls.
2 : a large military force especially : army sense 1a the French Foreign Legion
3 : a very large number : multitude won him … a legion of devoted followers— Irving Kolodin
4 : a national association of ex-servicemen the American Legion



Definition of legion (Entry 2 of 2)

: many, numerous the problems are legion

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Synonyms & Antonyms for legion

Synonyms: Noun

Synonyms: Adjective

Antonyms: Adjective

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Examples of legion in a Sentence

Noun Legions of people came to see him perform. joined the French Foreign Legion Adjective the obstacles that the programmers had to overcome have been legion
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Recent Examples on the Web: Noun This is how Bryant and his daughter are being remembered by legions of adoring fans. Christina Zdanowicz, CNN, "Memorials honoring Kobe and Gianna Bryant are popping up all over the world," 27 Jan. 2020 They were joined by legions of attorneys from organizations like the American Civil Liberties Union, who volunteered to counsel and represent detainees and their families on the spot. Osita Nwanevu, The New Republic, "The Rise of the Permanent Protest," 1 Jan. 2020 Any reference to revamping the Giants’ recent approach to building a winning team will be welcomed by the legions of irritated fans. Bill Pennington, New York Times, "The Giants Begin Another Rebuild, but Keep the Same Architect," 30 Dec. 2019 Wherever there was a commotion, reporters and camera crews rushed in, followed by legions of curious onlookers brandishing selfie sticks. Jiayang Fan, The New Yorker, "Hong Kong’s Protest Movement and the Fight for the City’s Soul," 9 Dec. 2019 Every month, one lucky young man is chosen to be adorned by legions of fans on Twitter. Gabe Bergado, Teen Vogue, "Twitter’s White Boy of the Month Meme Is a Match Made in Heaven Between Celebrity and Internet Culture," 26 Aug. 2019 In how-to videos watched by legions of her followers, Kim Kardashian West has touted the crucial role Tatcha’s mist-containing ginseng plays in blending the contour cream on her face. Khanh T.l. Tran, latimes.com, "She gave up everything to start beauty brand Tatcha. What happens after it’s sold?," 8 July 2019 Beyond the ranks of gangsters, legions of Americans were committing or abetting crime. David Crary, Anchorage Daily News, "Prohibition began 100 years ago, and its legacy remains," 15 Jan. 2020 Beyond the ranks of gangsters, legions of Americans were committing or abetting crime. Washington Post, "Prohibition began 100 years ago, and its legacy remains," 14 Jan. 2020

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

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First Known Use of legion


13th century, in the meaning defined at sense 1


1687, in the meaning defined above

History and Etymology for legion

Noun and Adjective

Middle English, from Anglo-French, from Latin legion-, legio, from legere to gather — more at legend

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Time Traveler for legion

Time Traveler

The first known use of legion was in the 13th century

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Statistics for legion

Last Updated

19 Feb 2020

Cite this Entry

“Legion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/legion. Accessed 23 Feb. 2020.

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More Definitions for legion


How to pronounce legion (audio)

English Language Learners Definition of legion

 (Entry 1 of 2)

: a large group of soldiers in ancient Rome
: a large group of soldiers
: a national organization for former soldiers



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

: very many or numerous


le·​gion | \ ˈlē-jən How to pronounce legion (audio) \

Kids Definition of legion

1 : a group of from 3000 to 6000 soldiers that made up the chief army unit in ancient Rome
3 : a very great number She has a legion of admirers.

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