le·​gion | \ ˈlē-jən \

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

army, array, battalion, host

Synonyms: Adjective

beaucoup [slang], many, multifold, multiple, multiplex, multitudinous, numerous

Antonyms: Adjective


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Examples of legion in a Sentence


Legions of people came to see him perform. joined the French Foreign Legion


the obstacles that the programmers had to overcome have been legion
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Recent Examples on the Web: Noun

Unsurprisingly, Timothée stans are pretty pissed about this blunder—so much so that many of our legion have decided to boycott the Oscars altogether. Cady Drell, Marie Claire, "This Week in Timothée Chalamet," 25 Jan. 2019 Her success passing the Affordable Care Act in 2010 has won her legions of supporters on the party’s left wing, especially as President Donald Trump and the Republicans have tried to repeal the health care law. Ella Nilsen, Vox, "House progressives are getting ready to fight off Nancy Pelosi’s challengers.," 21 Nov. 2018 On Wednesday, a Montana federal judge dealt Anglin a significant setback, holding that the First Amendment does not protect Anglin's right to publish Gersh's personal information and encourage his legion of anti-Semitic followers to harass her. Timothy B. Lee, Ars Technica, "Judge rejects neo-Nazi’s First Amendment argument in harassment case," 15 Nov. 2018 Both Camila and Dylan shared the same cheeky Instagram post with their legions of followers on Thursday night (August 23), teasing an upcoming collaboration of sorts. Allie Fasanella, Teen Vogue, "Camila Cabello and Dylan Sprouse Working on a "Secret Project"," 24 Aug. 2018 And then, of course, there were her legions of real-life fangirls—a generation of adoring moviegoers who instantly fixated on her most scene-stealing asset: that crisp, clean, dazzlingly uncomplicated haircut. Kate Branch, Vogue, "A Love Letter to the ’90s Bob That Changed Everything," 15 July 2018 The lampshade is one of a legion of pleated shades that are making a comeback since the style's heyday in the Victorian era. Jennifer Fernandez, House Beautiful, "Pleated Lampshades Are On Their Way Back," 13 Dec. 2018 The assault was being launched from 65 countries, a legion of zombie computers pressed into service by the attack’s architects. Benjamin Wofford, Vox, "The midterms are already hacked. You just don’t know it yet.," 25 Oct. 2018 The freewheeling low-stakes website for throwing bad jokes into the abyss has transformed into an enormous public forum inhabited by just about everyone who's anyone, plus a legion of the worst people on the planet. Eric Limer, Popular Mechanics, "How to Delete All Your Tweets," 2 Aug. 2018

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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Dictionary Entries near legion






legionary ant


Statistics for legion

Last Updated

5 Feb 2019

Look-up Popularity

Time Traveler for legion

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

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More Definitions for legion



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 \

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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More from Merriam-Webster on legion

Rhyming Dictionary: Words that rhyme with legion

Thesaurus: All synonyms and antonyms for legion

Spanish Central: Translation of legion

Nglish: Translation of legion for Spanish Speakers

Britannica English: Translation of legion for Arabic Speakers

Britannica.com: Encyclopedia article about legion

Comments on legion

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


to deny responsibility for

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