Um, "we already defined" - the referent(s) of that phrase are very ambiguous, I'm afraid. Who's "we" and where was that definition ?

It's a royal 'we' in this case: Some subset of the group of commenters here at LW, and that subset doesn't include me. It was discussed at some length in the recent discussion of consciousness. I wasn't paying much direct attention to the conversation, though, so I can't be more specific than that. (I'm not even sure that the relevant bits are all in one post's comments.)