evangelist

1. (Christianity) An itinerant or special preacher, especially a revivalist, who conducts services in different cities or locations, now often televised.Synonyms: gospeler

2. (biblical) A writer of a gospel, especially the four New Testament Gospels (Matthew, Mark, Luke, and John), usually capitalized (Evangelist).

3. (primitive Church) A person who first brought the gospel to a city or region.

4. (Church of Jesus Christ of Latter-day Saints) A patriarch.

5. (by extension) A person marked by extreme enthusiasm for or support of any cause, particularly with regard to religion.Examples: "Booth, William (1829-1912) English evangelist; founder and first general of the Salvation Army ... his subordinates being expected to give him unquestioning obedience."; "Yet in the spreading consumer market of the mid-1700s, his renditions competed with others offering a far different account of the evangelist and his message. The famous artist William Hogarth mocked Whitefield in two engravings presenting the revivalist as a religious fanatic who held sway over the superstitious lower orders."; "The film implies that the evangelist, as a type, is a fanatic, a sanctimonious prig, and ultimately a hypocrite."broadly

6. (technology) A person hired to promote a particular technology.Examples: "developer evangelist"; "[…] and has worked in multiple roles, including as the C# Product Manager and as a Developer Evangelist in the Mid-Atlantic district."