Definitions for: Ontology

[n] the metaphysical study of the nature of being and existence

Webster (1913) Definition: On*tol"o*gy, n. [Gr. ? the things which exist
(pl.neut. of ?, ?, being, p. pr. of ? to be) + -logy: cf.F.
ontologie.]
That department of the science of metaphysics which
investigates and explains the nature and essential properties
and relations of all beings, as such, or the principles and
causes of being.

See Also: metaphysics