What Do You Mean By God? - Prabhupada 0475
670303 - Lecture SB 07.06.01 - San Francisco
Bhāgavata-dharma means dealings with the Personality of Godhead. There are many kinds of dealings. So when our dealings are with the Supreme Personality of Godhead, that is called bhāgavata-dharma. Bhāgavata means from the word bhagavān. Bhagavān means the person who has got all the six opulences in full. He is called Bhagavān, or God.
In most scriptures of the world there is idea of God, but actually there is no definition of God. But in the Śrīmad-Bhāgavatam, because it is science of God, there is definition, what do you mean by God. The definition is that one person who has got six opulences in full, He is God.