noun
a person, especially a diplomat, invested with the full power of independent action on behalf of their government, typically in a foreign country
adjective
having full power to take independent action
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The plenipotentiary ambassador was authorized to negotiate on behalf of the government.
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The plenipotentiary representative had the power to make decisions without consulting anyone else.
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The plenipotentiary dude was calling all the shots at the meeting.
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She felt like a plenipotentiary ruler in her own domain.