1. The native language or dialect of a specific region or group of people; the ordinary language spoken by common people in a particular place, as distinguished from formal, literary, or standard language
Shakespeare wrote much of his work in the English vernacular language rather than Latin.
Shakespeare escreveu grande parte de sua obra na língua vernácula inglesa em vez do latim.
2. The everyday speech of ordinary people; colloquial language used in informal contexts
The doctor explained the medical condition in vernacular language so the patient could understand.
O médico explicou a condição médica em linguagem vernácula para que o paciente pudesse entender.