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The study of the internal structure of expressions, especially between words and phrases, and the principles and processes that determine it. This includes words order, but also the grammatical relations that hold between words, as well as structural ambiguity, binding, reference, and similar issues. Common approaches are numerous phrase structure grammars (GPSG, HPSG, LFG, G&B, X-bar, Minimalism, ...) and, on the other hand, dependency grammars.

Syntax refers not just to the study, but also to the rules that govern this arrangement and to the Linguistics branch that studies it.