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universal grammar, theory proposing that humans possess innate faculties related to the acquisition of language. The definition of universal grammar has evolved considerably since first it was postulated and, moreover, since the 1940s, when it became a specific object of modern linguistic research. It is associated with work in generative grammar, and it is based on the idea that certain aspects of syntactic structure are universal. Universal grammar consists of a set of atomic grammatical categories and relations that are the building blocks of the particular grammars of all human languages, over which syntactic structures and constraints on those structures are defined. A universal grammar would suggest that all languages possess the same set of categories and relations and that in order to communicate through language, speakers make infinite use of finite means, an idea that Wilhelm von Humboldt suggested in the 1830s. From this perspective, a grammar must contain a finite system of rules that generates infinitely many deep and surface structures, appropriately related. It must also contain rules that relate these abstract structures to certain representations of sound and meaning—representations that, presumably, are constituted of elements that belong to universal phonetics and universal semantics, respectively.