Ferdinand de Saussure
Course in General Linguistics

Saussure's most influential work, Course in General Linguistics (Cours de linguistique générale), was published posthumously in 1916 by former students Charles Bally and Albert Sechehaye, based on notes taken from Saussure's lectures in Geneva. The Course became one of the seminal linguistics works of the 20th century not primarily for the content (many of the ideas had been anticipated in the works of other 20th-century linguists) but for the innovative approach that Saussure applied in discussing linguistic phenomena.

Its central notion is that language may be analyzed as a formal system of differential elements, apart from the messy dialectics of real-time production and comprehension. Examples of these elements include his notion of the linguistic sign, which is composed of the signifier and the signified. Though the sign may also have a referent, Saussure took that to lie beyond the linguist's purview.

Throughout the book, he stated that a linguist can develop a diachronic analysis of a text or theory of language but must learn just as much or more about the language/text as it exists at any moment in time (i.e. "synchronically"): "Language is a system of signs that expresses ideas". A science that studies the life of signs within society and is a part of social and general psychology. Saussure believed that semiotics is concerned with everything that can be taken as a sign, and he called it semiology.
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