Vine's Expository Dictionary of NT Words
lit., "a messenger of good" (eu, "well," angelos, "a messenger"), denotes a "preacher of the Gospel," Acts 21:8; Ephesians 4:11 , which makes clear the distinctiveness of the function in the churches; 2 Timothy 4:5 . Cp. euangelizo, "to proclaim glad tidings," and euangelion, "good news, gospel." Missionaries are "evangelists," as being essentially preachers of the Gospel.
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Vines, W. E., M. A. Entry for 'Evangelist'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/e/evangelist.html. 1940.