Heteroglossia
The term heteroglossia describes the coexistence of distinct varieties within a single "language" (in Greek: hetero- "different" and glōssa "tongue, language"). In this way the term translates the Russian разноречие [raznorechie] (literally "different-speech-ness"), which was introduced by the Russian linguist Mikhail Bakhtin in his 1934 paper Слово в романе [Slovo v romane], published in English as "Discourse in the Novel."