Thus, events arguably deserve their own ontological category.

Many philosophers have attempted to reduce the number of distinct ontological categories.

Essentialists view such identities as ontological categories defining social actors, and not the result of social action.

Strictly speaking, in what ontological category of things are causes and other conditions, the things which comprise causal circumstances?

The core belief of process philosophy is the claim that events and processes are the principal ontological categories.

Process philosophy is Heraclitan in the sense that a fundamental ontological category is change.

They argue instead that there is no need to posit the mind or mindstuff as an ontological category.

Many philosophers have considered ideas to be a fundamental ontological category of being.

Aristotle regarded quantity as a fundamental ontological and scientific category.

Such an understanding of ontological categories, however, is merely taxonomic, classificatory.