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Numerous; vast; very great in number.
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(military, Ancient Rome) The major unit or division of the Roman army, usually comprising 3000 to 6000 infantry soldiers and 100 to 200 cavalry troops.
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(military) A combined arms major military unit featuring cavalry, infantry, and artillery, including historical units such as the British Legion, and present-day units such as the Spanish Legion and the French Foreign Legion.
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(military) A large military or semi-military unit trained for combat; any military force; an army, regiment; an armed, organized and assembled militia.
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(often Legion or the Legion) A national organization or association of former servicemen, such as the American Legion.
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A large number of people; a multitude.
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(often plural) A great number.
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(dated, taxonomy) A group of orders inferior to a class; in scientific classification, a term occasionally used to express an assemblage of objects intermediate between an order and a class.
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(transitive) To form into legions.