Definition of legionnaire noun from the Oxford Advanced Learner's Dictionary

 

legionnaire

 noun
noun
BrE BrE//ˌliːdʒəˈneə(r)//
 
; NAmE NAmE//ˌliːdʒəˈner//
 
 
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a member of a legion, especially the French Foreign Legion Word Origin early 19th cent.: from French légionnaire, from légion ‘legion’, from Latin legio, 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).
See the Oxford Advanced American Dictionary entry: legionnaire