The Ontological Argument for the Existence of God

[Jenny A]

It's so easy to forget that the term 'maximally great' means something specific within the context of the argument, as in, the most fully expressed actuality. Outside Scholasticism the term has no meaning.

I think "the most fully expresed actuallity" is a term in need of definition.  And yes to be an actuallity of any kind a thing must exist, but the argument falls apart with the notion that if we can imagine something that must exist to meet it's definition, it must therefore exist. We conceive of things that do not and even cannot exist all the time.