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

Even still, a year-long do-good campaign might not win over the legion of LeBron haters that have developed since his 2010 heel turn. — Jacob Feldman, Sportico.com, 10 July 2026

Fishback’s constant sniping at Israel, including his use of antisemitic dog whistles, has attracted legions of conservative fans, as well as national headlines and columns. — Will Carless, USA Today, 10 July 2026

The rules governing red cards are sacrosanct in the international game, and Belgium were joined by legions of federations, fans, pundits, heads of state and former referees in excoriating FIFA for the decision to let Balogun play. — Julian Cardillo, Boston Herald, 7 July 2026

Of course, Swift married Kansas City Chiefs tight end Travis Kelce at Madison Square Garden on Friday, in a ceremony that brought more than 1,000 high-profile guests and legions of fans to New York. — Emma Hinchliffe, Fortune, 6 July 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