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
Sal Pizarro, Mercury News, 21 June 2025
The team’s Hollywood ties are legion, from Jack Nicholson on the sidelines to Jerry Buss courting celebrities with the Forum Club.
—Tom Tapp, Deadline, 18 June 2025
The list of projects that fall prey to the sunk cost fallacy are legion.
—Neil Senturia, San Diego Union-Tribune, 16 June 2025
Humongous Entertainment launched Backyard Baseball in October 1997 on Windows and Mac devices, earning a legion of fans with its cartoon art and set of diverse kid characters.
—Jacob Feldman, Sportico.com, 12 June 2025
See All Example Sentences for legion
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Noun
The opening was very special for Mountain View Mayor Ellen Kamei, who helped cut the ribbon with a legion of Mountain View city and chamber of commerce officials.
—Sal Pizarro, Mercury News, 21 June 2025
The team’s Hollywood ties are legion, from Jack Nicholson on the sidelines to Jerry Buss courting celebrities with the Forum Club.
—Tom Tapp, Deadline, 18 June 2025
The list of projects that fall prey to the sunk cost fallacy are legion.
—Neil Senturia, San Diego Union-Tribune, 16 June 2025
Humongous Entertainment launched Backyard Baseball in October 1997 on Windows and Mac devices, earning a legion of fans with its cartoon art and set of diverse kid characters.
—Jacob Feldman, Sportico.com, 12 June 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 8 Jul. 2025.
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