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.
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
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Merriam-Webster unabridged
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Time Traveler for legion
The first known use of legion was in the 13th century
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