vernacular - vocabulary

adjective

Concerning language, indigenous or native, as opposed to learned or literary; using plain, ordinary language; also pertaining to a style of architecture employing techniques, decorative arts, materials, etc., common to a particular place or time.

noun

Usually refers to the language of class or profession; the native speech of a place or region; also a style of architecture employing techniques, decorative arts, materials, etc., common to a particular place or time.

You will find that the truth is often unpopular and the contest between agreeable fancy and disagreeable fact is unequal. For, in the vernacular, we Americans are suckers for good news.

—Adlai E. Stevenson New York Times, June 9, 1958