Vernacular
VERNACULAR (Lat. verna, dim. vernaculus, a slave born in his master's house), a term meaning native or indigenous, belonging to the country where a person is born. The word is practically confined in English usage to language, whether of the country as a whole or of particular dialects or idioms.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)