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

Keep scrolling for more

Synonyms & Antonyms for legion

Synonyms: Noun

Synonyms: Adjective

Antonyms: Adjective

Visit the Thesaurus for More 

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
See More
Recent Examples on the Web: Noun That Nadal and Djokovic are now within hailing distance of Federer’s record surely has led every Fed fan -- and there are, of course, legions of them around the world -- to think about the major titles that got away. oregonlive, "Roger Federer’s career Grand Slam record is in danger as rivals make determined push: 2020 Australian Open," 19 Jan. 2020 Finally, the garnishes for posole, of whatever color or construction, are legion, and certainly a matter of convenience, availability or taste. Bill St. John, The Denver Post, "Here are three versions of posole with winter on its way," 18 Sep. 2019 Lake's post has been live for less than 24 hours and has already garnered nearly 30,000 likes and legions of comments. Kaleigh Fasanella, Allure, "Ricki Lake Just Shaved Her Head After Struggling With Hair Loss for Over 30 Years," 2 Jan. 2020 But legions of devoted listeners — a drive-time audience of millions tuned in to 100 radio stations across the country and a cable television network — adored his irreverence and gut-fighter’s instincts. Robert D. Mcfadden, New York Times, "Don Imus, Radio Host Who Pushed Boundaries, Dies at 79," 27 Dec. 2019 The new film, directed by J.J. Abrams, had to navigate tricky waters, pleasing legions of Star Wars fans while also delivering a conclusion to the current trilogy of pictures. Fortune, "Newest Star Wars Film Produces Another Box Office Hit for Disney," 23 Dec. 2019 Add Harry Styles to Lizzo‘s legions of fans — and vice versa! Ashley Boucher, PEOPLE.com, "Harry Styles Lights Up the BBC Radio 1 Stage with a Cover of 'Juice' — and Lizzo Loves It," 18 Dec. 2019 And who doesn’t love the swirling sounds of slot machines, seizure-inducing flashing lights and legions of saps on their bottom dollar and their seventh Seven&Seven. Jordan Riefe, Orange County Register, "Have a sinfully good time at Heavenly’s winter wonderland," 25 Nov. 2019 And not just on the growing legions of elderly Americans; defense and other areas of discretionary spending have also shot up under Trump’s presidency. Catherine Rampell, Twin Cities, "Catherine Rampell: The deficit has gotten worse. This shouldn’t be a surprise.," 16 Oct. 2019

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.

See More

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

Keep scrolling for more

Learn More about legion

Time Traveler for legion

Time Traveler

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

See more words from the same century

Statistics for legion

Last Updated

22 Jan 2020

Cite this Entry

“Legion.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/legion?pronunciation&lang=en_us&dir=l&file=legion01. Accessed 26 January 2020.

Keep scrolling for more

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.

Keep scrolling for more

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 express in a more acceptable way

Get Word of the Day daily email!

Test Your Vocabulary

Intact Latin Quiz

  • roman tablet
  • What did focus mean in Latin?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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

Love words? Need even more definitions?

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