Plenipotentiary
/ˌplenɪpəˈtenʃieri/
Definition 1 of 2
Pro Tip 1/3Diplomatic Term
Used in political or international relations contexts, not casual conversation. 
A plenipotentiary was appointed to discuss the new trade policy.
Pro Tip 2/3Authority 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.
Pro Tip 3/3Specialized 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.
Compare with
AgentAmbassadorConsulDelegateDiplomatEnvoyMinisterProxyRepresentative
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