Swiss linguist and author Ferdinand de Saussure was born #OTD in 1857.
In his Cours de linguistique générale, published after his death by his students, he defined certain fundamental concepts (distinction between language, speech & language, between synchronicity & diachronicity, arbitrariness of the linguistic sign, etc.) that would inspire not only later linguistics, but also other areas of the human sciences such as ethnology, literary analysis, philosophy & Lacanian psychoanalysis.

