Langue régionale.
ETYM French dialecte, Latin dialectus, from Greek, to converse, discourse. Related to Dialogue.
The usage or vocabulary that is characteristic of a specific group of people; SYN. idiom, accent.
Variation of a spoken language shared by those in a particular area or a particular social group or both. The term is used to indicate a geographical area (“northern dialects”) or social group (“black dialect”).
The term is sometimes used subjectively, in a judgmental and perhaps dismissive way. In that case, the standard language of a community is not seen as a dialect itself, but as the proper form of that language, dialects being considered in some way corrupt. This is a matter of social attitude, not of linguistic study.