What is Enlightenment?

Enlightenment is not easily defined. An Atheist, a Buddhist, a Neopagan, a Christian, and a Hindu may all use the term Enlightenment and mean something entirely different. In Thelema it's defined as "Knowledge and Converstation with your Holy Guardian Angel," in Buddhism it is the "Extinction of the Self," and in some esoteric sects of Christianity awareness of "Christ Consciousness." Each of these 3 systems of "enlightenment" have different methods for obtaining it, and different ways to measure one who has obtained enlightenment. In some systems it's the final step for humans, in others it is only the first step.