Etymology
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ontology (n.)

"the metaphysical science or study of being and the essence of things," 1660s (Gideon Harvey), from Modern Latin ontologia (c. 1600); see onto- + -logy. Related: Ontologist.

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Definitions of ontology

ontology (n.)
(computer science) a rigorous and exhaustive organization of some knowledge domain that is usually hierarchical and contains all the relevant entities and their relations;
ontology (n.)
the metaphysical study of the nature of being and existence;
From wordnet.princeton.edu