According to a test I once took, I'm a "non-conformist intellectual". On a personal note: I read stuff (like non-fiction books and poetry), but I also get bored easily (if what I read is badly written, outside of my field of knowledge or just doesn't interest me).
What I'm missing in those definitions is that, I thought at least, intellectual applies to alpha sciences rather than beta. So, according to the dictionary, Stephen Hawking is an intellectual - which makes perfect sense.
@Bill3000: I don't think intellectuals are a class, though... as that usually defines a scoial stratum.