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

 

millionaire

 noun
noun
BrE BrE//ˌmɪljəˈneə(r)//
 
; NAmE NAmE//ˌmɪljəˈner//
 
 
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a person who has a million pounds, dollars, etc.; a very rich person an oil millionaire She's a millionaire several times over. a millionaire businessman Word Origin early 19th cent.: from French millionnaire, from million, probably from Italian milione, from mille ‘thousand’.
See the Oxford Advanced American Dictionary entry: millionaire

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