Matessuch

Matessuch is a coined term used primarily in speculative philosophy and science fiction worldbuilding to denote entities whose identity, properties, or significance depend on a specific physical substrate. It contrasts with abstract or immaterial entities whose status does not require material realization. The term is not part of standard ontological taxonomy but is used in informal discussions to explore how material context shapes meaning and persistence.

Etymology and usage: The word appears to be a blend of matter and such, and is used as both an adjective (matessuch properties) and a noun (a matessuch). Its definition varies by author, with core themes including substrate grounding, context sensitivity, and dependency on material instantiation.

Conceptual role: In ontology and philosophy of science, matessuch is invoked to discuss problems of identity and change when a thing’s essential properties are tied to its material substrate. Critics worry the term can obscure distinctions between mere material conditions and metaphysical essences; supporters argue it clarifies how material support can ground functional or relational properties.

In speculative fiction and worldbuilding, matessuch constructs allow creators to explore how different materials alter behavior, durability, or meaning. Examples often involve artifacts whose capabilities shift with material composition or environments, highlighting the interplay between substance and function.

See also: ontology, materialism, substrate theory, grounding, philosophical realism.