|Origin:||vernaculus 'born in a place', from verna 'slave born in his or her owner's house'|
ver‧nac‧u‧lar [countable usually singular]
a form of a language that ordinary people use, especially one that is not the official language
in the vernacular
Galileo wrote in the vernacular to reach a larger audience.
He lapsed into the local vernacular (=language spoken in a particular area).
a style of building, music, art etc that is suitable for ordinary people
vernacular American speech