bidialectalism

bi·di·a·lec·tal

B0234600 (bī′dī-ə-lĕk′təl)adj. Using two dialects of the same language.
bi′di·a·lec′tal·ism n.bi′di·a·lec′tal·ist n.

bidialectalism

(ˌbaɪdaɪəˈlɛktəlɪzəm) n (Linguistics) the state of being bidialectal