Definition of legion adjective from the Oxford Advanced Learner's Dictionary

 

legion

 adjective
adjective
BrE BrE//ˈliːdʒən//
 
; NAmE NAmE//ˈliːdʒən//
 
 
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[not before noun] (formal) very many synonym numerous The medical uses of herbs are legion. Word Origin Middle English: via Old French from Latin legio(n-), from legere ‘choose, levy’. The adjective dates from the late 17th cent., in early use often in the phrase my, their, etc. name is legion, i.e. ‘we, they, etc. are many’ (Mark 5:9) in the Bible.
See the Oxford Advanced American Dictionary entry: legion