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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.