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Catholic Dictionary

Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.

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ONTOLOGY

The science of being. In scholastic philosophy it is the equivalent of metaphysics, or at least of that branch of metaphysics which deals with the philosophy of reality. (Etym. Greek ontos, being + logia, science, knowledge.)