I. ˈlē-jən noun
Etymology: Middle English, from Anglo-French, from Latin legion-, legio, from legere to gather — more at legend
Date: 13th century
1. : the principal unit of the Roman army comprising 3000 to 6000 foot soldiers with cavalry
2. : a large military force ; especially : army 1a
3. : a very large number : multitude
4. : a national association of ex-servicemen
II. adjective
Date: 1678
: many , numerous
the problems are legion