of or pertaining to ontology, the branch of metaphysics that studies the nature of existence or being as such; metaphysical: Some of the U.S. founders held an ontological belief in natural rights.
Sometimes, ontologic, ontologistic.

nonontological, adjective
unontological, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ontology (ɒnˈtɒlədʒɪ)
1.  philosophy the branch of metaphysics that deals with the nature of being
2.  logic the set of entities presupposed by a theory

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Some of the lists were corny and cerebral, while others sailed in from some
  ontological outfield.
Ontological emotion, however stumbled on, has something authoritative for the
  individual who feels it.
The ontological basis of information remains to be fully understood.
The second is ontological: how an individual human acquires the power of speech
  and understanding.
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