Nonsubstance

Nonsubstance is a rarely used term in philosophy and ontology that refers to entities considered not to possess independent subsistence or a basic substratum. In classical Aristotelian ontology, substances are the things that exist independently and underlie the properties they bear; nonsubstance would denote entities that do not themselves stand as independent beings.

Because the term is not standardized, its exact meaning varies. In some discussions it is used to designate properties, relations, events, or abstract objects that depend on substances for their being or intelligibility. In this sense, nonsubstances are often contrasted with substances as dependent or non-substantial entities.

Examples commonly associated with the notion of nonsubstance include properties such as color or size, which do not exist independently of the objects they characterize; relations like “between A and B,” which require relata; and events or processes that appear to depend on underlying substrata for their instantiation. Abstract objects such as numbers or propositions are also sometimes treated as non-substantial in certain ontological frameworks, depending on whether one accepts them as independent existents.

Historically, debates about what counts as a substance versus a non-substance reflect broader questions about the priority of matter, form, and universals. In modern metaphysics, scholars more often speak of properties, relations, states, and abstract objects rather than using the label nonsubstance; the term serves mainly as a shorthand for discussions about dependent or non-independent entities within various ontological systems.

See also: substance (philosophy), ontology, property (philosophy), relation, predication.