Used in political or international relations contexts, not casual conversation. A plenipotentiary was appointed to discuss the new trade policy.
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Authority Level
Indicates someone with the highest authority to make decisions without seeking approval. Only a plenipotentiary can sign this treaty on behalf of the state.
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Specialized Usage
Commonly used when referring to representatives in serious negotiations or formal agreements. The plenipotentiary managed to get all parties to agree to the terms.