Katharevousa vs. Koine — What's the Difference?

Katharevousa (Greek: Καθαρεύουσα, pronounced [kaθaˈrevusa], literally "purifying [language]") is a conservative form of the Modern Greek language conceived in the late 18th century as both a literary language and a compromise between Ancient Greek and the contemporary vernacular, Demotic Greek. Originally, it was widely used for both literary and official purposes, though sparingly in daily language.

A dialect of Greek that developed primarily from Attic and became the common language of the Hellenistic world, from which later stages of Greek are descended.

Koine A lingua franca.

Koine A regional dialect or language that becomes the standard language over a wider area, losing its most extreme local features.

A lingua franca.

A regional language that becomes standard over time.

A Greek dialect that flourished under the Roman Empire

A common language used by speakers of different languages;