Enlightenment is the action of achievement, even in a moment, of the state of Nirvana. Nirvana can mean "quenching" (like from a forge) or "blowing out". There

Enlightenment is the action of achievement, even in a moment, of the state of Nirvana. Nirvana can mean "quenching" (like from a forge) or "blowing out". There are definitely various interpretations what this actually means, but the early texts indicate it to be the extinguishing of Dukkha (stress) in the target subject. The subject arrives at this state (of no suffering) by way of understanding the origins of stress to be the fact of impermanence of all things, including a soul. Of course there are thousands of ways to become enlightened (science for one tells a lot about impermanence), but there is a single effect of those ways which is the most direct for the given context. If you really want to see behind the curtain, go sit in Vipassana. This is what Buddha suggested, if one is interested in this attainment!