
Many Christians, churches, and organizations regularly use the word gospel to describe their convictions. Theological controversies have occurred and do occur over the meaning of the gospel and who preaches it faithfully. What does that familiar word gospel mean? The best way to answer that question is to turn to the Bible.
In the Greek New Testament, the noun euangelion (“gospel”) appears just over seventy times. Since, in one sense, the whole New Testament is about the gospel, we might have expected the word to have been used more frequently. Even more surprisingly, its use varies greatly among the authors of the New Testament books. Paul uses the word more than three times as often as all the other authors combined. Most of the other uses are found in Matthew and Mark, with very few, if any, in Luke, John, Peter, and James.
The word gospel most simply means “good news.” The word is not unique to the Christian message, but it was also used in the pagan world to refer to a good announcement. In the New Testament, it refers to the good news of Jesus the Savior. Often, it is used with the assumption that the reader knows what the word means.
(read more here: https://www.ligonier.org/blog/what-gospel/ )