A structural connection or dependence that holds between two or more entities whose explanatory role is not exhausted by the entities' individual intrinsic (monadic) properties; a way entities stand to one another that can be the subject of true relational propositions.

Principle

When a relation obtains between entities, that relational fact can be individuated and invoked in explanation independently of describing each entity's intrinsic properties alone.

Demonstration

Situation: Two people, A and B, stand in the relation 'is parent of'. Recognition: We identify the parental relation between A and B rather than only describing A's or B's biological traits. Action: We attribute duties, genealogical patterns, and causal relations on the basis of that relation. Consequence: Explanations and predictions (e.g., inheritance lines, parental responsibilities) track the relational fact, not merely the pair of monadic predicates of each person.

Misapplication

Treating every apparent relational claim as reducible to a conjunction of intrinsic predicates (e.g., saying 'A is taller than B' is nothing more than 'A has height h' and 'B has height g') ignores the directional and comparative structure that the relation encodes and may erase asymmetry or dependence encoded by the relation.

Consequence

Recognizing relations as explanatorily distinct enables relational propositions to serve as proper truth‑makers and supports analyses that attribute causal, normative, or structural roles to inter-entity connections.

Reversal

Some metaphysical frameworks hold that alleged relations are reducible to patterns of intrinsic properties or regularities among property-instantiations; under such reduction the autonomy attributed to relations is denied and the stated principle is qualified or rejected.

Boundary

Clearly within: binary comparative relations such as 'is taller than' or social relations like 'is creditor of'. Boundary case: dispositional or modal relations (e.g., 'tends to cause') where the relational claim depends on counterfactual or probabilistic context. Clearly outside: an intrinsic property of a single object (e.g., mass) which is not a connective structure between entities.

Semantic Tension

Relation ↔ Intrinsic Property — whether explanatory weight should reside in inter-entity structures or in the properties of individual entities constrains interpretation and theory choice.

Synthesis

Relations function as structural connectors: they are not mere aggregates of monadic predicates but vehicles that specify how entities jointly contribute to states of affairs and to the truth of relational propositions.