This article is about the philosophical issues relating to a certain class of nominative words. For general grammatical information, see
Proper noun."A proper name [is] a word that answers the purpose of showing what thing it is that we are talking about" writes
John Stuart Mill in A System of Logic (1. ii. 5.), "but not of telling anything about it". The problem of defining proper names, and of explaining their meaning, is one of the most recalcitrant in modern philosophy.
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