vernacular

Short definition from Wiktionary

Noun

1. 1
   The language of a people or a national language.
2. 2
   Everyday speech or dialect, including colloquialisms, as opposed to standard, literary, liturgical, or scientific idiom.
3. 3
   Language unique to a particular group of people.
4. 4
   A language lacking standardization or a written form.
5. 5
   Indigenous spoken language, as distinct from a literary or liturgical language such as Ecclesiastical Latin.
6. 6
   A style of architecture involving local building materials and styles; not imported.

Adjective

1. 1
   Of or pertaining to everyday language, as opposed to standard, literary, liturgical, or scientific idiom.
2. 2
   Belonging to the country of one's birth; one's own by birth or by nature.
3. 3
   Of or related to local building materials and styles; not imported.
4. 4
   Connected to a collective memory; not imported.
5. 5
   Not attempting to use the rules of a taxonomic code, especially, not using scientific Latin.