Categories
Aristotle's short treatise on the ten basic kinds of being — the first part of the Organon
Tradition: Classical Greek philosophy / Aristotelian logic
Ten kinds of being — substance, quantity, quality, relation, place, time, position, possession, action, passion — the basic types under which everything that is falls
The Categories is the opening text of Aristotle's Organon and one of the most consequential short philosophical works in Western thought. Across fifteen short chapters Aristotle introduces the ten "categories" — the basic kinds of being under which everything that is falls: substance (the primary category), quantity, quality, relation, place, time, position, possession, action, passion. The work distinguishes "primary substance" (this particular horse, this particular man) from "secondary substance" (the species "horse," the genus "animal"). The Categories shaped medieval logic, scholastic ontology (the Porphyrian tree descends from it), early-modern philosophy (Kant's twelve categories are Aristotle's ten transformed), and modern analytic ontology (Strawson's Individuals, Wiggins's Sameness and Substance).
Author
Editions cited
- Categories and De Interpretatione (J. L. Ackrill, Oxford, 1963)
- The Complete Works of Aristotle (Jonathan Barnes, Princeton, 1984)
School Embodiments
The Categories develops the distinction between primary and secondary substance that is foundational for the hylomorphic analysis of natural substances.
"Substance, in the truest and primary sense, is that which is neither asserted of a subject nor present in a subject." (Categories 5, 2a11)
The Categories's working ontological realism — substances are real, properties are real, relations are real — has shaped Western realist metaphysics for over two millennia.
"There are ten ways of saying something is." (Categories, paraphrasing the central thesis)
Medieval scholastic logic and ontology — Boethius's commentary, Aquinas's logic, the Porphyrian tree — descends directly from the Categories. Aquinas's metaphysics presupposes the framework.
"An individual man, an individual horse — these are substances in the strictest sense." (Categories 5)
Kant's twelve categories of the understanding (in the first Critique's Transcendental Analytic) are explicitly modelled on Aristotle's ten, with the crucial transformation that Kantian categories are mind-supplied rather than world-discovered.
"Aristotle, in his rhapsody, was the first to attempt a tabulation of the categories." (Kant's Critique of Pure Reason A80/B106, on his Aristotelian inheritance)
Modern analytic ontology (Strawson, Wiggins, David Wiggins, Michael Loux, E. J. Lowe) takes Aristotle's Categories as foundational.
"Substance is most properly so called because it can support contraries." (Categories 5, 4a10)
Falsafa took over Aristotelian logic and ontology directly. Al-Farabi, Avicenna, and Averroes all wrote commentaries on the Categories.
"Of things themselves, some are predicable of a subject, and others are present in a subject." (Categories 2, 1a20)
Descartes's analysis of substance (in the Principles of Philosophy) engages the Categories' distinction of substance from its attributes.
"Substance is most properly that which can support both white and not-white." (paraphrasing Categories 5)
The Categories is in implicit dialogue with Plato's theory of Forms — Aristotle's primary substance is the individual concrete particular, against Plato's universal Forms as primarily real.
"Universal substance is so called only in a secondary sense." (Categories 5, paraphrasing)
Internal Tensions
Whether the ten categories are exhaustive, mutually exclusive, or organised by a single principle has been disputed since Plotinus. Kant's twelve are organised by a different principle; modern analytic ontology often modifies the list. The relation between the Categories' primary-substance ontology and the Metaphysics' more form-centred ontology has been the central interpretive question of Aristotelian metaphysics.
I. Time
Time is one of the ten categories — substantival in the Aristotelian framework (more relational in the Physics).
Attributes
II. Space
Place is another of the ten categories — the where of substances.
Attributes
III. Matter
Primary substances are concrete particulars; secondary substances are species and genera. The hylomorphic analysis is implicit but not developed.
Attributes
IV. Observer
The Aristotelian observer of the Categories is the rational animal classifying beings under their proper kinds. Active, plural; cosmic-ordering rather than personal-providential framework.
Attributes
V. Energy
Action and passion are two of the categories; energeia (actuality) is implicit in the substance-accident framework.
Attributes
VI. Information
Real ontological categories preserve real information about being. Personal information famously unsettled in Aristotle.
Attributes
Personas that cite this work
Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How Categories resolves each dilemma
51 resolved positions across 4 dimensions · 6 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.