Meaning

noun a preacher of the Christian gospel

noun (when capitalized) any of the spiritual leaders who are assumed to be authors of the Gospels in the New Testament: Matthew, Mark, Luke, and John

originFrom Old French evangeliste, equivalent to evangel + -ist, from ecclesiastical Latin evangelista, from ecclesiastical Ancient Greek εὐαγγελιστής (euangelistḗs, “bringer of good news”), from εὐαγγελίζεσθαι (euangelízesthai, “to evangelize”), from εὐάγγελος (euángelos, “bringing good news”), from εὖ (eû, “well”) + ἀγγέλλειν (angéllein, “to announce”).

Etymology from Wiktionary, CC BY-SA 3.0