To me "God" means that out of which all phenomena arise. All energy. All things. The original intelligence out of which all intelligence is an extension. The Unmanifest out of which arises manifestation. The Infinite.

"God" also means Unity to me...Oneness...as opposed to concepts like separation and duality. There's only one thing that forms a complete Unity and that's the Infinite, because the Infinite comprises absolutely everything.

It's what religions attempt to refer to in various ways when they talk about God, but it would exist even if no religions existed. It would exist if no human beings existed. It would exist if nothing finite and observable whatsoever existed...in which case, there would be no one talking about it. ;-)