Sorry, I know this is a bit out of date, and I'm not sure whether this would go here or in a new thread.

Just thought I'd mention that another meaning canon has taken on is, in terms of the lore of a novel or game, what is 'true' in the world of that game/novel, for example in Tolkein's Middle Earth, an example of canon would be that Hobbit's feet are covered in curly hair similar to that on their head, or that there were nine Ringwraiths.