I'll just throw this back out there because I think it was missed the first time.
D&D is a game (fun activity) but not a contest (competative activity).
nah, it wasn't missed. By the 2nd dictionary posting on page 1, I had ammended my personal concept of a game.
@Morrus;'s definition from somewhere in Wikipedia more closely matches my broadened assumption of a game, which was:
a fun activity, with some rules.
I added the "with some rules" part to the dictionary definition which i felt was crap as it described everything a kid does. Even as a kid, if you asked me what I was doing, I wouldn't answer "playing a game" unless I was actually playing a game (even if it was one I made up). I bet most kids would answer similarly.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.