Ontological priority is a metaphysical concept denoting a hierarchical relation between entities, properties, or categories whereby one is considered more fundamental, basic, or antecedent than another. An entity A is said to be ontologically prior to entity B if the existence, nature, or identity of B depends on, is grounded in, or is constituted by A. Conversely, B is ontologically dependent on A. The notion is employed to articulate theories about the structure of reality, the ordering of beings, and the grounding relations that explain how less fundamental aspects of the world obtain their status.
Core Definition
- Ontological priority: The relation in which entity X is more basic or antecedent in the ontological hierarchy than entity Y, such that Y’s being or properties are ontologically dependent on X.
- Ontological dependence: The counterpart relation in which Y cannot exist or retain its identity without X.
Historical Development
The term and its associated ideas trace back to early modern and contemporary discussions of metaphysics:
| Period | Key Figures | Contribution |
|---|---|---|
| Early modern (17th–18th c.) | Gottfried Wilhelm Leibniz, Immanuel Kant | Explored the grounding of contingent truths in necessary, more fundamental principles. |
| 20th century | Roderick Chisholm, Peter van Inwagen, David Lewis | Formalized notions of ontological dependence and priority, particularly in the context of the analysis of possible worlds and the hierarchy of entities (e.g., persons, objects, universals). |
| Late 20th–21st century | Jonathan Schaffer, Amie Thomasson, Michael Loux | Developed “priority monism,” which holds that the whole (the cosmos) is ontologically prior to its parts, and discussed the priority of universals over particulars, and of concrete over abstract entities. |
Major Theoretical Contexts
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Grounding – Ontological priority is frequently discussed alongside the notion of grounding, a metaphysical relation that explains how some facts or entities “give rise to” or “determine” others. Grounding relations are often taken to be asymmetric, transitive, and explanatory.
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Priority Monism vs. Pluralism – In the debate over whether reality consists of a single fundamental whole (monism) or multiple independent entities (pluralism), ontological priority is a central criterion. Priority monists argue that the universe as a whole is ontologically prior to its constituent parts.
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Universals and Particulars – Some accounts maintain that universals (properties, relations) are ontologically prior to particulars (individual objects), because particulars instantiate universals, implying a dependence of particulars on the more general.
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Abstract vs. Concrete – Discussions of whether abstract objects (numbers, propositions) are ontologically prior to concrete objects involve assessing the explanatory role of abstract entities in accounting for the structure of the world.
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Temporal vs. Logical Priority – While ontological priority is not identical to temporal precedence, certain theories align ontological priority with logical or causal ordering, asserting that entities that exist earlier in time or that are causally prior are also ontologically prior.
Criteria for Establishing Ontological Priority
Philosophers have proposed several criteria to evaluate when one entity is ontologically prior to another:
- Explanatory Role: X provides a more fundamental explanation for the existence or nature of Y.
- Dependence Relations: Y cannot exist without X; X is necessary for Y’s existence.
- Irreducibility: X cannot be reduced to or derived from Y, whereas Y can be reduced to X.
- Metaphysical Simplicity: X is metaphysically simpler (e.g., lacking contingent parts) than Y.
Representative Arguments
- Schaffer’s Priority Monism: Argues that the universe (the whole) is ontologically prior to its parts because the parts are ontologically dependent on the whole’s existence and structure.
- Lewis’s Modal Realism: Considers possible worlds as ontologically prior to the entities that exist within them, because worlds provide the modal framework in which entities are situated.
- Van Inwagen’s Mereology: Suggests that wholes are ontologically prior to their constituent parts, as parts depend on the existence of a whole that aggregates them.
Criticisms and Debates
- Circularity Concerns: Critics argue that grounding relations can be circular if the criteria for priority rely on the very dependence they intend to explain.
- Indeterminacy of Grounding: Some philosophers question whether grounding, and thus ontological priority, can be uniquely identified without appeal to contentious metaphysical assumptions.
- Alternative Hierarchies: Competing approaches, such as ontic structural realism, propose that relational structures—not objects—are ontologically prior, challenging object‑centric priority notions.
Related Concepts
- Metaphysical Grounding
- Ontological Dependence
- Hierarchical Ontology
- Mereology (the study of part‑whole relations)
- Fundamentality (the status of being more basic in the ontological order)
References (selected)
- Schaffer, Jonathan. “Ontological Priority: A Discussion of Priority Monism.” Philosophical Studies 105 (2003): 31‑48.
- van Inwagen, Peter. Metaphysics. Oxford University Press, 2001.
- Lewis, David. On the Plurality of Worlds. Blackwell, 1986.
- Chisholm, Roderick. “Ontological Dependence.” Philosophical Review 59 (1950): 97‑122.
- Loux, Michael. Metaphysics: A Contemporary Introduction. Routledge, 2006.
Note: The above entry reflects the prevailing usage of the term “ontological priority” in contemporary analytic philosophy and related scholarly literature.