Enlightenment is the term used to translate terms like Satori and Moksha, but it isn't the right word really. It just stuck. It isn't like being a Saint; it is much more specific and it doesn't require a lifetime of being on one's best behavior. It has to be described in negative terms, and that is like describing a big empty room by listing all the things that aren't in it. It also isn't enough to consciously know things about Enlightenment. This is about that part of you in the back of your mind that knows better but gets in trouble anyway.