Definition of ambassador plenipotentiary in English:

ambassador plenipotentiary

noun

  • An ambassador with full powers to sign treaties or otherwise act for the state or monarch.

    • ‘In accordance with this the ambassadors plenipotentiary duly appointed by both parties appeared at the said time and places named.’
    • ‘During the Civil War, Dr Ikejiani was director of laboratory services, and Ambassador Plenipotentiary.’
    • ‘Following that, he held various posts, mainly in Japan but also elsewhere, before once again becoming ambassador plenipotentiary to Japan in February, 2004.’