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Regional Italian is any regional variety of the Italian language.
Such vernacular varieties and standard Italian exist along a sociolect continuum, and are not to be confused with the local indigenous languages of Italy that predate the national tongue or any regional variety thereof. Among these languages, the various Tuscan, Corsican and Central Italian lects are, to some extent, the closest ones to standard Italian in terms of linguistic features, since the latter is based on a somewhat polished form of Florentine.
The various forms of Regional Italian have phonological, morphological, syntactic, prosodic and lexical features which originate from the underlying substrate of the original language.