Diglossia, a linguistic term in which, in a given society, there are two (often) closely related languages, one of high prestige, which is generally used by the government and in formal texts, and one of low prestige, which is usually the spoken vernacular tongue
Heinz Kloss calls the (H) variant exoglossia and the (L) variant endoglossia.
The Valencian sociolinguist Rafael Ninyoles i Monllor coined the term linguistic conflict by the end of the 1960s for referring to certain diglossic situations, such as the Valencian one.