the spreading of the Christian gospel by public preaching or personal witness.
Evangelism is the announcement, proclamation, and/or preaching of the gospel (1 Corinthians 15:1-4), the good news of and about Jesus Christ. Therefore, the gospel is a communicated message—communicated in verbal (Luke 7:22 ; Romans 10:14-17) and/or written (Luke 1:1-4) form.
The English word “evangelism” comes from the Greek word euaggelion. Most literally translated in the noun form, euaggelion means : “gospel” or “good news.” In the verb form (euaggelizesthai), the meaning of the word changes slightly to “announce” or “bring good news.” The Greek word in its various forms appears fifty-five times in the New Testament. In addition to the before-mentioned translations, the Greek word is also translated as “preach.”
Evangelism, the communication of the gospel message, includes a warning, an explanation, and a call. Evangelism includes warning people about sin and the consequences of sin (John 16:8 ; Acts 24:25 ; Revelation 20:11-15). It includes an explanation of God’s remedy for sin—the gospel (Acts 8:29-35 ; Romans 3:21-26 ; 2 Corinthians 5:21). And it includes the clear call to repent (to turn from sin and to turn toward God) and believe the gospel, by faith (Mark 1:15 ; Luke 13:1-5 ; Acts 17:29-31 ; Romans 1:17 ; Romans 10:9-13).