-_jē noun
( -es )
Etymology: New Latin ontologia, from ont- + -logia -logy
1.
a.
(1) : a science or study of being ; specifically : a branch of metaphysics relating to the nature and relations of being
(2) : a particular system according to which problems of the nature of being are investigated
b. : first philosophy
2. : a theory concerning the kinds of entities and specifically the kinds of abstract entities that are to be admitted to a language system