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ontology
on·tol·o·gy [ on tólləjee ] (plural on·tol·o·gies)


noun 
Definition:
 
1. study of existence: the most general branch of metaphysics, concerned with the nature of being
2. theory of existence: a particular theory of being
[Early 18th century. < modern Latin, "study of being" < Greek ont- "being" (see onto-)]

on·tol·o·gist [ on tólləjist ] noun
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