Distinguish the language system (langue) from the totality of language (langage) (difference of nature and difference of extension). In its totality, language is heterogeneous, personal and social, mental and physiological…
Benveniste, expounding Saussure, establishes langue as a system distinct from langage by nature and scope, the former being the structured social code extracted from the heterogeneous whole of linguistic capacity.
, Last Lectures: Collège de France 1968 and 1969, 2012thesis