The Oxford Thesaurus An A-Z Dictionary of Synonyms - vernacularadj.

1) native, local, regional, indigenous, autochthonous: Old Hebrew fell out of use, to be replaced by vernacular Aramaic. 2) popular, informal, colloquial, conversational, ordinary, familiar, everyday, spoken, vulgar, vulgate; plain, simple, straightforward, easy: We have both the vernacular and the formal, literary, or clerical levels of language. Can you translate this scientific gobbledegook into vernacular English that we can understand? --n. 3) jargon, patois, argot, cant, idiom, phraseology, language, talk, speech: Alf occasionally slips into the vernacular of a Billingsgate fishmonger (his former calling ) .