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

 

parvenu

 noun
noun
BrE BrE//ˈpɑːvənjuː//
 
; NAmE NAmE//ˈpɑːrvənuː//
 
(pl. parvenus)(formal, disapproving)
 
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a person from a low social or economic position who has suddenly become rich or powerful Word Origin early 19th cent.: from French, literally ‘arrived’, past participle of parvenir, from Latin pervenire ‘come to, reach’.
See the Oxford Advanced American Dictionary entry: parvenu