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. A vernacular disease. His skill the vernacular dialect of the Celtic tongue. (Fuller) Which in our vernacular idiom may be thus interpreted. (pope)
Origin: L. Vernaculus born in one's house, native, fr. Verna a slave born in his master's house, a native, probably akin to Skr. Vas to dwell, E. Was.