a representative sent on a mission or errand

emissaries to negotiate a peace.

an agent sent on a mission of a secret nature, as a spy.

Anatomy . sending or coming out, as certain veins that pass through the skull and connect the venous sinuses inside with the veins outside.

pertaining to an emissary.

Archaic . sent forth, as on a mission.

noun

agent , ambassador , bearer , carrier , consul , courier , delegate , envoy , front , go-between , herald , hired gun * , intermediary , internuncio , legate , messenger , rep , representative , scout , spy , deputy