I love the Buddha's simple definition of enlightenment as "the end of suffering."
There is nothing superhuman in that, is there? Of course, as a definition, it is incomplete. It only tells you what enlightenment is not: no suffering. But what's left when there is no more suffering? The Buddha is silent on that, and his silence implies that you'll have to find out for yourself. He uses a negative definition so that the mind cannot make it into something to believe in or into a superhuman accomplishment, a goal that is impossible for you to attain. Despite this precaution, the majority of Buddhists still believe that enlightenment is for the Buddha, not for them, at least not in this lifetime E.T.