plenipotentiary

US /ˌplen.ɪ.poʊˈten.ʃi.er.i/

UK /ˌplen.ɪ.poʊˈten.ʃi.er.i/

Bevollmächtigte

relating to or having the authority to represent your country in another country:

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a plenipotentiary diplomat/role