envoy

n. 1 messenger or representative. 2 (in full envoy extraordinary) diplomatic agent ranking below ambassador. [french envoyer send, from latin via way]

n. One dispatched upon an errand or mission; a messenger; esp., a person deputed by a sovereign or a government to negotiate a treaty, or transact other business, with a foreign sovereign or government; a minister accredited to a foreign government. An envoy's rank is below that of an ambassador.