Plenipotentiary (noun)

A person authorized to represent a government or organization and empowered to take decisions on its behalf.

Origin:

Late 16th century, from latin plenipotentiarius, from plenus 'full' + potentia 'power'.

Examples:

1. The ambassador was appointed as the plenipotentiary of his country, with the power to negotiate treaties and represent its interests.
2. The plenipotentiary had a great deal of authority, able to make decisions and sign agreements without consulting his superiors.
3. The plenipotentiary mission was a success, with the signing of a new trade agreement between the two countries.
4. The plenipotentiary was known for his diplomatic skills, able to find common ground and resolve conflicts in a peaceful manner.
5. The plenipotentiary was highly respected by both his own government and the foreign governments he interacted with.