vernacular Definition

vernacular
noun

1. The native language of a country or people, as opposed to a foreign language that is also in use.
2. The form of a language as commonly spoken, as opposed to the formal or literary language.

Thesaurus: speech, dialect, idiom, tongue, parlance.
3. The language or jargon of a particular group.
4. humorous
Slang or indecent language.

adj

1. Referring to or in the vernacular.

Thesaurus: informal, colloquial, common, popular, local.
2. Local; native.

Example: vernacular architecture

Derivative: vernacularly
adverb

Etymology: 17c: from Latin vernaculus native.