Charles Berner, the originator of the Enlightenment Intensive explains his definition of enlightenment published in Enlightenment and the Enlightenment Intensive; Volume 1. http://www.amazon.com/dp/1492267546
“Enlightenment literally means to put light onto so one can be conscious of what one has set out to experience. Enlightenment is the direct experience of the truth. In the case of self enlightenment, it is the direct experience of the truths of you. By direct experience is meant, by no way or via. Not by seeing, thinking, believing, deciding, reasoning, feeling, or any way ‘by way of’. Direct experience of the truth is Enlightenment. The first important, well documented enlightenment was that of Buddha.”
Here’s a review of the book by an Amazon Customer.
“This small but well written book tells you everything you need to know about the enlightenment intensive process. Maybe there is a lot more to be written but the simplicity of the process and structure is just what it needs to be an powerful process of rediscovering yourself to your true nature. Less is more and just follow the instructions given it will lead you thru the process. The book also covers the (mental) processes and phases that come with the enlightenment process and how to ‘coach’ people in all steps of the process. And you should also check Volume 2 and Knowing Your Self.”