noun
1. : a representative of one country stationed in another ; especially : a representative of the government of one British Commonwealth country in the capital of another with representational functions broadly similar to those of an ambassador — compare agent-general
2.
a. : the chief officer of a colonial territory or dependency
b. : the chief representative officer in a mandate, protectorate, or trust territory
3. : the chief officer of an international commission or other agency
the United Nations high commissioner for refugees