I asked Google’s new Glossary for the definition of god (an appropriate question). The first response:
Obviously, this is an impossible word to define. After all, to “define” a thing means putting boundaries around it, and God is Infinity, the very absence of boundaries.
See other cool rumblings at Google Labs.
A cop-out of an answer, if you ask me. But then, thousands and thousands of people have spent thousands and thousands of years trying to answer that one. And they haven’t progressed very far, so maybe Google’s right.