VERNAC'ULAR, adjective [Latin vernaculus, born in one's house, from verns, a servant.] 1. Native; belonging to the country of one's birth. English is our vernacular language. The vernacular idiom is seldom perfectly acquired by foreigners. 2. Native; belonging to the person by birth or nature. A vernacular disease, is one which prevails in a particular country or district; more generally called endemic.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI