plenipotentiary

An ambassador who independently represents their home country in another country can be called a plenipotentiary.

The word plenipotentiary comes from Latin roots, plenus, "complete or full and potentem, "powerful." Someone who is a plenipotentiary literally has full powers to represent their government — the prime minister or president has officially authorized them to sign treaties or other agreements on behalf of that government. Some (but not all) diplomats are plenipotentiaries.

Definitions of plenipotentiary
1

n a diplomat who is fully authorized to represent his or her government

Type of:
diplomat, diplomatist
an official engaged in international negotiations

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