http://www.discipleshiptools.org/apps/articles/default.asp?blogid=4216&view=post&articleid=41083&link=1&fldKeywords=&fldAuthor=&fldTopic=0

It means from the Greek, "A Good Message" literally or more to the point "Good News" referring to a message of good tidings such as...

http://www.discipleshiptools.org/apps/articles/default.asp?blogid=4216&view=post&articleid=41082&link=1&fldKeywords=&fldAuthor=&fldTopic=0

This was the rallying cry of the Reformation. The main point that caused Luther and Calvin to challenge the Catholic Church and it's teachings.

http://www.discipleshiptools.org/apps/articles/default.asp?blogid=4216&view=post&articleid=41081&link=1&fldKeywords=&fldAuthor=&fldTopic=0

The Gospel is the lightning rod that conducts God's creative and loving power, because it reveals the justice of God in the justification of the ungodly!

http://www.discipleshiptools.org/apps/articles/default.asp?blogid=4216&view=post&articleid=41080&link=1&fldKeywords=&fldAuthor=&fldTopic=0

The thesis statement or main theme of Romans, if not the entirety of our Christian faith!