Linguistics defined as the analysis of formal structures in a text or discourse WordNet 3.0 & Open English WordNet

Structural linguistics, or structuralism, in linguistics, denotes schools or theories in which language is conceived as a self-contained, self-regulating semiotic system whose elements are defined by their relationship to other elements within the system. Wikipedia

A 1916 theory that a human language is self-contained structure related to other elements which make up its existence Wikipedia Disambiguation

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The theory that a human language is a self-contained structure related to other elements which make up its existence. Wiktionary

Theory that a human language is a self-contained structure. Wiktionary (translation)