I assume "Gi" is an alternate romanization of "Ki". (Otherwise, I assume you're talking about learning to use your uniform.

)
And I agree. I could try defining enlightenment, and someone here would have a different defintion. I see no reason why both couldn't be accurate, because it's an experience, an internal thing. As such, it bears a different definition by each person, whether they've experienced it or not.
While I can teach a person to use what I refer to as "Ki", I also know that some of the things that were absolute light-igniters for me prove to be no help to them. Some people do it naturally, and others struggle for years with the concept. I'd say that's a reasonable analogy for enlightenment.