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

 

arriviste

 noun
noun
BrE BrE//ˌæriːˈviːst//
 
; NAmE NAmE//ˌæriːˈviːst//
 
(from French, disapproving)
 
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a person who is determined to be accepted as a member of a social group, etc. to which they do not really belong Word Origin early 20th cent.: from French, from arriver, based on Latin ad- ‘to’ + ripa ‘shore’.
See the Oxford Advanced American Dictionary entry: arriviste