Philosophers have many differing views on what the fundamental categories of being are.

It was considered to be one of four fundamental categories for the theory of grammar, the others being unit, structure and class.

In metaphysics, and especially ontology, a concept is a fundamental category of existence.

Bowne emphasized the person as the fundamental category for explaining reality and asserted that only persons are real.

In the view of many historians, "emotion" is, therefore, just as fundamental a category of history, as class, race or gender.

In this paper, he argued for four "fundamental categories" for the theory of grammar: unit, structure, class, and system.

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

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

To understand the reasons for this choice, and to appreciate the work it has yielded, one must consider these fundamental categories more carefully.

Aristotle regarded quantity as a fundamental ontological and scientific category.