<philosophy of science, logic> a standard by means of which to judge the features of things. Possession of appropriate criteria necessarily constitutes adequate evidence for our attribution of the feature in question. Thus, as Wittgenstein noted, for example, observation of writhing and groaning are criteria for our belief that someone is in pain. Recommended Reading: Ludwig Wittgenstein, Blue and Brown Books (Harpercollins, 1986); Ludwig Wittgenstein, Philosophical Investigations, tr. by G. E. M. Anscombe (Prentice Hall, 1999); and John V. Canfield, Wittgenstein, Language and the World (Massachusetts, 1981).
[A Dictionary of Philosophical Terms and Names]
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