Are universals real entities or just convenient labels we attach to the world?

Ideas & Philosophy · Published 29 September 2026 Swipe more like this →

In short: Nominalism challenges the existence of abstract universals like beauty or humanity. It argues that only individual, physical things exist, and general terms are merely names. This perspective, which traces back to medieval debates, suggests our categories are mental constructs rather than reflections of a hidden, objective reality beyond our reach.

At its core, nominalism addresses the problem of universals: why do we group distinct things, like individual cats or green objects, under a single label? Realists argue that a universal—a shared 'catness' or 'greenness'—exists independently of the objects themselves. Nominalists reject this, asserting that only particular, concrete entities exist in space and time. For them, general terms are simply names, or 'nomen', used to classify individuals that share certain resemblances or satisfy specific linguistic predicates.

The movement gained prominence in medieval philosophy, with William of Ockham serving as a central figure. Ockham famously advocated for parsimony, arguing that we should not assume the existence of entities that are not necessary for explanation. If we can explain the world by referring only to individuals, positing a separate realm of abstract forms adds nothing of value. This approach, often linked to 'Ockham's razor', reflects a broader shift toward prioritizing the individual over the universal, a move some scholars argue helped pave the way for the modern nation-state and secular thought.

Conceptualism offers a middle ground, suggesting that universals are not real entities but concepts formed within the human mind. Yet, critics argue this merely shifts the problem to psychology. If we correctly apply a concept to two different individuals, there must be some objective basis for that classification, which brings us back to the original metaphysical puzzle. In contemporary analytic philosophy, nominalism persists in efforts to reconstruct mathematics without relying on set theory, attempting to build scientific theories using only concrete individuals.

Recent scholarship has complicated the historical narrative of nominalism. While the fourteenth century is often cited as its heyday, the explicit divide between a 'via moderna' (nominalism) and 'via antiqua' (realism) only gained widespread traction in the fifteenth century. Some historians now question whether a coherent 'nominalist school' existed in the fourteenth century at all, suggesting that the traditional story of a long-standing, binary conflict may be a later, retrospective construction.

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