/ ˈemɪsəri; NAmE -seri/ noun
( pl. -ies ) ( formal ) a person who is sent to deliver an official message, especially from one country to another, or to perform a special task
SYN envoy
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WORD ORIGIN
early 17th cent.: from Latin emissarius scout, spy, from emittere send out, from e- (variant of ex- ) out of + mittere send.