What is ontology?

Ontology is ontology. Existentialism is meaningful and supports all concepts. If not, then there is nothing to say. Interpretation is the supporting thing and the fundamental meaning.

Materialist ontology is the idea that matter determines spirit (consciousness), that is, there is matter, not spirit. Spiritual existence is Plato's table, only the table of concept is immortal and eternal, and the table of matter is missing and disappearing. Material existence refers to Aristotle's object existence, and then there is the concept (that is, the entity first, then the nature and species relationship). But Aristotle does not have the idea of evolution, so the concept is static, and dialectical materialism means that the developing entity (matter) is the form of existence.

Obviously, I agree that Marx's philosophy itself is ontological, so there should be no philosophy that denies ontology.