Definitions from Wiktionary ( )

▸ noun:  (linguistics, strict sense) A lect (often a regional or minority language) as part of a group or family of languages, especially if they are viewed as a single language, or if contrasted with a standardized idiom that is considered the 'true' form of the language (for example, Bavarian as contrasted with Standard German).
▸ noun:  (linguistics, broad sense) A variety of a language that is characteristic of a particular area, community, or social group, differing from other varieties of the same language in relatively minor ways as regards grammar, phonology, and lexicon.
▸ noun:  (derogatory) Language that is perceived as substandard or wrong.
▸ noun:  (colloquial, offensive) A language existing only in an oral or non-standardized form, especially a language spoken in a developing country or an isolated region.
▸ noun:  (computing, programming) A variant of a non-standardized programming language.
▸ noun:  (ornithology) A variant form of the vocalizations of a bird species restricted to a certain area or population.

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