noun
minister plenipotentiary
A diplomatic rank below ambassador, with full authority to represent the sending state. Used in historical and formal contexts.
彼は全権公使として条約交渉に臨んだ。
He attended the treaty negotiations as minister plenipotentiary.
Compound of 全権 (plenipotentiary, full authority) and 公使 (minister, envoy). The term is a direct translation of the Western diplomatic rank 'minister plenipotentiary'.