Don't really have a meaningful one. I'm happy to work with whatever definition / concept people want, and will take stances accordingly. With some who don't see the universe as being any different to the way I do, but choose to call the universe God, I merely dispute the notion of referring to it as God. With others there is an implied metaphysical element to it, and while I do not / can not argue for the non-existence of such, I dispute the claims that there is evidence of its existence. Then there are often implications of intelligence, benevolence, and other anthropomorphic qualities. Again, I don't argue for the non-existence of such, just that they can be known, or that there is evidence of such. I guess my concept would be that if god exists he is unknowable, although I can't know for sure whether it is even possible to know that much.