Metaphysics may owe its grand name to a librarian's shelving decision
Aristotle never used the word metaphysics. An editor roughly two centuries after him, probably Andronicus of Rhodes, seems to have titled a book that way simply because it came after the Physics. The subject it names, though, is as big as they come: what exists, what kinds of thing there are, and how they hang together.
The Greek phrase ta meta ta phusika can be read as what comes beyond physics, and many take it to mean questions too general for observation to settle. The shelving explanation is less romantic but plausible. English picked up the term in the mid-1500s through Latin. Aristotle himself called the inquiry first philosophy, implying every other branch rests on it, and older definitions cast it as the science of first causes or the study of being as such.
Its questions include what it means to exist, whether universals like redness are real alongside particulars like a single apple, what makes something possible or necessary, how space, time and causation work, how mind relates to matter, and whether free will survives determinism. Alexius Meinong held that there are objects that do not exist, such as Pegasus and Santa Claus. Plato thought his perfect forms enjoyed a higher grade of existence than imperfect matter.
Much effort goes into sorting everything into categories. Aristotle proposed ten, with substances such as a horse at the centre and qualities, quantities and places depending on them. Kant offered twelve, grouped into four classes, though he treated them as principles of human understanding rather than features of the world. That shift was pivotal. Kant separated speculation about reality beyond experience from critical inquiry into the structure of thought itself, and P. F. Strawson later contrasted describing our shared conceptual scheme with revising it for a better one.
Roots reach back to the Upanishads, Taoism and the pre-Socratics. Early modern thinkers split general metaphysics, or ontology, from special branches covering the cosmos, the mind and the divine, and many comprehensive systems of the modern era were idealist. Twentieth-century critics questioned both the reliability of metaphysical methods and whether its theories mean anything, prompting new approaches. Even so, ontologies now organise data in artificial intelligence and economics, and psychiatry asks what kind of thing a disease really is.
Source: Metaphysics
