noun
Refers to a group of diplomats sent abroad for official purposes, such as negotiations or representation.
日本は国交樹立のために外交使節団を派遣した。
Japan dispatched a diplomatic mission to establish diplomatic relations.
外交団 refers more broadly to the diplomatic corps or the body of diplomats in a country, while 外交使節団 specifically denotes a mission or delegation sent for a particular purpose.
Compound of 外交 (diplomacy), 使節 (envoy), and 団 (group).