plenipotentiary      
noun [ C ]  old-fashioned formal uk/ˌplen.ɪ.pəˈten.ʃər.i/ us/ˌplen.ɪ.poʊˈten.ʃi.er.i/
 全权大使,全权代表
a person who has the authority to represent his or her country, especially in another country
 
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