Source: p 120 Middle, Introducing Philosophy for Canadians: A Text with Integrated Readings (2011 1 ed).
Here, we will begin by discussing the Ontological Argument. This is the most difficult of the three, for it is a purely logical proof─it attempts to argue from the idea of God to His necessary existence.
I know the definition and etymology of 'ontological', but are not all arguments for God's existence 'ontological'? If so, then 'ontological' is a hypernym. So the Ontological Argument should be called something else, perchance the Definitional or the Self-Evident or Self-Satisfying Argument (because you need only the definition of God as omnibenevolent, omnipotent, and omnipresent; and Deductive Logic; to deduce the conclusion)?