[n] the everyday speech of the people (as distinguished from literary language)
[n] a characteristic language of a particular group (as among thieves); "they don't speak our lingo"
[adj] being or characteristic of or appropriate to everyday language; "common parlance"; "a vernacular term"; "vernacular speakers"; "the vulgar tongue of the masses"; "the technical and vulgar names for an animal species"
\Ver*nac"u*lar\, a. [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.] 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.'' --Harvey. His skill the vernacular dialect of the Celtic tongue. --Fuller. Which in our vernacular idiom may be thus interpreted. --Pope.
\Ver*nac"u*lar\, n. The vernacular language; one's mother tongue; often, the common forms of expression in a particular locality.