noun
ambassador extraordinary and plenipotentiary
A formal diplomatic rank; an ambassador with full powers to represent their country, often sent on a special mission.
日本は国連に特命全権大使を派遣した。
Japan dispatched an ambassador extraordinary and plenipotentiary to the United Nations.
大使 is a general term for ambassador, while 特命全権大使 specifically denotes an ambassador with extraordinary and plenipotentiary powers, often for a special mission.
Compound of 特命 (special mission), 全権 (full powers), and 大使 (ambassador). A direct translation of the diplomatic term 'ambassador extraordinary and plenipotentiary'.