Noun legion has 4 senses
- host, legion - archaic terms for army
--1 is a kind of army, regular army, ground forces
--1 has particulars: Roman Legion; Sabaoth
- legion - association of ex-servicemen; "the American Legion"
--2 is a kind of association
- legion - a large military unit; "the French Foreign Legion"
--3 is a kind of military unit, military force, military group, force
--3 has members: legionnaire, legionary
--3 has particulars: foreign legion
- horde, host, legion - a vast multitude
--4 is a kind of multitude, throng, concourse
,