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The branch of metaphysics dealing with the nature of being. Recorded from the early 18th century, the word comes from modern Latin ontologia, from Greek ōn, ont− ‘being’, + the suffix −logy denoting a subject of study or interest.

In philosophy, the ontological argument is the argument that God, being defined as most great or perfect, must exist, since a God who exists is greater than a God who does not.

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