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
3
: a very large number : multitude
… won him … a legion of devoted followers.—
Irving Kolodin
Irving Kolodin4
: a national association of ex-servicemen
the American Legion
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
Tatiana Siegel, Variety, 13 Nov. 2025
In January, a trove of Gascón's social media posts throughout the years resurfaced, and their contents shocked her new legion of fans and admirers.
—Ryan Coleman, Entertainment Weekly, 13 Nov. 2025
So mighty was the penny’s sway that legions of sales pitches would rely on marketing psychology built upon its mere absence.
—Marc Ramirez, USA Today, 12 Nov. 2025
Flying anywhere for the Thanksgiving holiday is likely to be tortuous for legions of travelers — even if the government shutdown ends today, Transportation Secretary Sean Duffy warned today.
—Jay Blackman, NBC news, 8 Nov. 2025
See All Example Sentences for legion
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Noun
As an early and enthusiastic supporter of Zohran Mamdani, Piker played a key role in helping catapult the New York mayoral candidate to Gracie Mansion by spreading the Democrat’s socialist message to his legion of fans.
—Tatiana Siegel, Variety, 13 Nov. 2025
In January, a trove of Gascón's social media posts throughout the years resurfaced, and their contents shocked her new legion of fans and admirers.
—Ryan Coleman, Entertainment Weekly, 13 Nov. 2025
So mighty was the penny’s sway that legions of sales pitches would rely on marketing psychology built upon its mere absence.
—Marc Ramirez, USA Today, 12 Nov. 2025
Flying anywhere for the Thanksgiving holiday is likely to be tortuous for legions of travelers — even if the government shutdown ends today, Transportation Secretary Sean Duffy warned today.
—Jay Blackman, NBC news, 8 Nov. 2025
See All Example Sentences for legion
Cite this Entry
“Legion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/legion. Accessed 17 Nov. 2025.
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