plenipotentiary
🇺🇸
/ˌplenɪpəˈtenʃieri/
🇬🇧
/ˌplenɪpəˈtenʃəri/
able to make big decisions or take action for a country, especially in another country.
The president sent a plenipotentiary ambassador to the talks.
someone with the authority to make major decisions or act for their country, especially in a foreign place.
As a plenipotentiary, her job was to negotiate peace treaties.