What does the word plenipotentiary mean?

Answer:
The word plenipotentiary has two meanings,

As a noun, it refers to a person who has 'full powers'. In particular, the term commonly refers to a diplomat who is fully authorized to represent their government as a prerogative (i.e, an ambassador).

As an adjective, plenipotentiary refers to that which confers 'full powers'.
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