legion

1 of 2

noun

le·​gion ˈlē-jən 

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

legion

2 of 2

adjective

: many, numerous

the problems are legion

Synonyms of legion

Noun

• army

Adjective

• many
• numerous
• multiple

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

Recent Examples on the Web

Noun

Skeletor was supported by legions of laser-wielding, Stormtrooper-esque soldiers, though — thanks to Mattel's mandate that He-Man couldn't kill anyone — these were robots rather than people. — Richard Edwards, Space.com, 12 Aug. 2026

Though several of the film’s stars — Olivia Newton-John, Susan Buckner and Jeff Conaway — have died, the movie’s larger-than-life legacy remains, with legions of fans rewatching the film and sharing the classic clips on social media. — Diana Pearl, PEOPLE, 12 Aug. 2026

But to his legions of enemies — from MAGA reactionaries to the Anti-Defamation League to mere centrist Democrats — Piker is a loudmouth extremist who’s actively harming the country. — Josh Eells, Rolling Stone, 9 Aug. 2026

In petitions, legal action and IG posts, the Hollywood guilds and a legion of A-listers are pessimistic Ellison will keep his expansive theatrical promises if and when the deal finally closes. — Dominic Patten, Deadline, 6 Aug. 2026

Word History

Etymology

Noun and Adjective

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

First Known Use

Noun

13th century, in the meaning defined at sense 1

Adjective

1687, in the meaning defined above

Rhymes for legion

• region
• collegian
• norwegian
• subregion

Kids Definition

legion

noun

le·​gion

ˈlē-jən

1

: the chief unit of the Roman army consisting of 3000 to 6000 foot soldiers with cavalry

2

: army sense 1a

3

: a very large number : multitude