(noun sg neut nom/acc) "Gospel" is euaggelio, which means a "reward of good tidings," a "thank offering for good tidings, " "good news," and "good tidings." Originally, this term described a reward, like a tip, given to a messenger who brought good news. -- "Gospel" is from a noun that originally meant "a reward for good tiding given to a messenger." It was customary to reward a messenger who brought good news in the same way that we might tip someone. It later was used to denote "good tidings" and "good news" itself. See this article on the word "Gospel."