legion /ˈliː.d͡ʒən/noun 7adjective 1verb 1forms 3 noun7 •The major unit or division of the Roman army, usually comprising 3000 to 6000 infantry soldiers and 100 to 200 cavalry troops. •A large number of people; a multitude.Their complicated affairs are managed by a legion of accountants. •A great number.where one Sin has entered, Legions will force their Way through the fame Breach. — 1735 •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. •A large military or semi-military unit trained for combat; any military force; an army, regiment; an armed, organized and assembled militia. •A national organization or association of former servicemen, such as the American Legion. •(old-fashioned) 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. adjective1 •Numerous; vast; very great in number.Russia’s labor and capital resources are woefully inadequate to overcome the state’s needs and vulnerabilities, which are legion. verb1 •To form into legions. formslegioned · legioning · legions