noun Date: 1643 the nonclassical Latin of ancient Rome including the speech of plebeians and the informal speech of the educated established by comparative evidence as the chief source of the Romance languages
VULGAR LATIN
Meaning of VULGAR LATIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012