Vernacular1. (n.) One's mother tongue; the common forms of expression in a particular locality; as, the vernacular language.
2. (a.) 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.
Thesaurus Entries
Babbittish, Philistine, aboriginal, accustomed, ancient language, argot, austerity, autochthonous, average, baldness, bareness, bourgeois, campy, candor, cant, classical language, colloquial, colloquial speech, colloquial usage, colloquialism, common, common speech, commonplace, confined, conventional, conversational, conversationalism, current, customary, dead language, directness, easy, endemic, everyday, familiar, frankness, general, geographically limited, gibberish, gobbledygook, habitual, high-camp, homebred, homegrown, homely, homespun, household, household words, idiom, illiterate speech, indigenous, informal, informal English, informal language, informal speech, insular, jargon, kitschy, language, leanness, limited, lingo, living language, local, localized, low-camp, matter-of-factness, mother tongue, mumbo jumbo, natal, native, native language, native speech, native tongue, native-born, naturalness, nonstandard, normative, of a place, openness, ordinary, original, parent language, parochial, patois, patter, phraseology, plain, plain English, plain speaking, plain speech, plain style, plain words, plainness, plebeian, pop, popular, predominating, prescriptive, prevailing, primitive, prosaicness, prosiness, provincial, public, regional, regular, regulation, restrainedness, rustic style, scatology, severity, simple, simpleness, simplicity, slang, soberness, spareness, speech, spoken, spoken language, standard, starkness, stock, straightforward, straightforwardness, substandard, substandard language, taboo language, talk, topical, unadorned style, unadornedness, unaffectedness, uneducated, unimaginativeness, universal, unliterary, unpoeticalness, unstudied, usual, vernacularism, vocabulary, vulgar, vulgar language, vulgar tongue, vulgate, wonted