definition of
vernacular

[1] #1 vernacular n. [slang, cant, jargon, lingo, argot, patois] a characteristic language of a particular group (as among thieves); "they don't speak our lingo". wn

[2] #2 vernacular s. [common, vulgar] 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". wn

[3] #3 vernacular n. the everyday speech of the people (as distinguished from literary language). wn