Universal (metaphysics) | Wikipedia audio article
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Date: 2018-11-25

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Universal (metaphysics)

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"The only true wisdom is in knowing you know nothing."
- Socrates



SUMMARY
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In metaphysics, a universal is what particular things have in common, namely characteristics or qualities. In other words, universals are repeatable or recurrent entities that can be instantiated or exemplified by many particular things. For example, suppose there are two chairs in a room, each of which is green. These two chairs both share the quality of "chairness", as well as greenness or the quality of being green; in other words, they share a "universal". There are three major kinds of qualities or characteristics: types or kinds (e.g. mammal), properties (e.g. short, strong), and relations (e.g. father of, next to). These are all different types of universals.Paradigmatically, universals are abstract (e.g. humanity), whereas particulars are concrete (e.g. the personhood of Socrates). However, universals are not necessarily abstract and particulars are not necessarily concrete. For example, one might hold that numbers are particular yet abstract objects.  Likewise, some philosophers, such as D. M. Armstrong, consider universals to be concrete.
Most do not consider classes to be universals, although some prominent philosophers do, such as John Bigelow.