Definition of oligarch noun from the Oxford Advanced American Dictionary

     

    oligarch

     noun
    noun
    NAmE//ˈɑləˌɡɑrk//
     
     
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  1. 1a member of an oligarchy
  2. 2 an extremely rich and powerful person, especially a Russian who became rich in business after the end of the former Soviet Union the power of the oligarchs to influence the government
See the Oxford Advanced Learner's Dictionary entry: oligarch