multidialectal

/ˌmʌltiˌdaɪəˈlɛktəl/
adjective
  1. Able to speak or understand multiple dialects of a language.
    • Multidialectal speakers can switch between different forms of the same language easily.
    • The actor's multidialectal training helped him perform roles from various regions.
    • She is multidialectal, fluent in both standard Arabic and several regional dialects.