Vernacular a. : Belonging to the country of one's birth; one's own by birth or nature; native; indigenous; -- now used chiefly of language; as, English is our vernacular language.

Vernacular n. : The vernacular language; one's mother tongue; often, the common forms of expression in a particular locality.

Example:
What are the functional and Vernacular regions for Tanzania?

Taxonomy
vernacular, languages, Latin, grammars, vernacular dictionaries, dictionaries, vernacular language, Italian, national language, free encyclopedia, native language, global languages, Vernacular literature, vernacular culture, Spanish grammar, scholarly work, literature, liturgies.

Defination from the web:
Vernacular refers to the native language of a country or a locality. ... The vernacular is also often contrasted with a liturgical language (in linguistics, the relationship between these "High" and "Low" languages or ...