D defs.my
Entry 4 senses Webster, 1913

Legion

/(lē"jŭn)/ · Le·gion · IPA /ˈliː.d͡ʒən/
01 n. A body of foot soldiers and cavalry consisting of different numbers at different periods, -- from about four thousand to about six thousand…
  1. 1.
    A body of foot soldiers and cavalry consisting of different numbers at different periods, -- from about four thousand to about six thousand men, -- the cavalry being about one tenth.(Rom. Antiq.)
  2. 2.
    A military force; an army; military bands.
  3. 3.
    A great number; a multitude.
    “Where one sin has entered, legions will force their way through the same breach.” Rogers.
  4. 4.
    A group of orders inferior to a class.(Taxonomy)
Phrases & compounds
Legion of honor — an order instituted by the French government in 1802, when Bonaparte was First Consul, as a reward for merit, both civil and military.