An apostle, in its most literal sense, is an emissary, from Greek ἀπόστολος (apóstolos), literally "one who is sent off", from the verb ἀποστέλλειν (apostéllein), "to send off". The purpose of such sending off is usually to convey a message, and thus "messenger" is a common alternative translation; other common translations include "ambassador" and "envoy".
