- The definition of an emissary is a person sent on a mission, especially a diplomatic mission.
A diplomat sent to a foreign country to make peace is an example of an emissary.
Origin: Classical Latin emissarius ; from past participle of emittere: see emit
Used by arrangement with John Wiley & Sons, Inc.
noun pl. em·is·sar·ies
Origin: Latin ēmissārius, from ēmissus, past participle of ēmittere, to send out; see emit.
emissary - Medical Definition