information:filtering, stylistic:style_transfer
Opposition theory

A second key contribution comes from Saussure's notion of the organisation of language based on the principle of opposition. Saussure made a distinction between meaning (significance) and value. On the semantic side, concepts gain value by being contrasted with related concepts, creating a conceptual system that could in modern terms be described as a semantic network. On the level of the sound-image, phonemes and morphemes gain value by being contrasted with related phonemes and morphemes; and on the level of the grammar, parts of speech gain value by being contrasted with each other. Each element within each system is eventually contrasted with all other elements in different types of relations so that no two elements have the same value:

Saussure defined his theory in terms of binary oppositions: sign—signified, meaning—value, language—speech, synchronic—diachronic, internal linguistics—external linguistics, and so on. The related term markedness denotes the assessment of value between binary oppositions. These were studied extensively by post-war structuralists such as Claude Lévi-Strauss to explain the organisation of social conceptualisation, and later by the post-structuralists to criticise it. Cognitive semantics also diverges from Saussure on this point, emphasizing the importance of similarity in defining categories in the mind as well as opposition.

Based on markedness theory, the Prague Linguistic Circle made great advances in the study of phonetics reforming it as the systemic study of phonology. Although the terms opposition and markedness are rightly associated with Saussure's concept of language as a semiological system, he did not invent the terms and concepts that had been discussed by various 19th-century grammarians before him.