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
4
: a national association of ex-servicemen
the American Legion
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Merriam-Webster unabridged
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