Origin: Latin suffix -ular
Vernacular has 5 different meanings across 2 categories:
the everyday speech of the people (as distinguished from literary language)
The language of a people or a national language.
being or characteristic of or appropriate to everyday language
"common parlance"
"a vernacular term"
"vernacular speakers"
"the vulgar tongue of the masses"
"the technical and vulgar names for an animal species"
Of or pertaining to everyday language, as opposed to standard, literary, liturgical, or scientific idiom.
The word comes from the Latin vernāculus, which originally meant "domestic" or "pertaining to home-born slaves." It derives from verna, referring specifically to a person born into slavery within their master's household.