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dialect

noun

Linguistics. a variety of a language that is distinguished from other varieties of the same language by features of phonology, grammar, and vocabulary, and by its use by a group of speakers who are set off from others geographically or socially.
a provincial, rural, or socially distinct variety of a language that differs from the standard language, especially when considered as substandard.
a special variety of a language: The literary dialect is usually taken as the standard language.
a language considered as one of a group that have a common ancestor: Persian, Latin, and English are Indo-European dialects.
jargon or cant.

noun

1. a form of a language spoken in a particular geographical area or by members of a particular social class or occupational group, distinguished by its vocabulary, grammar, and pronunciation
2. a form of a language that is considered inferiorthe farmer spoke dialect and was despised by the merchants
3. (as modifier)a dialect word

1570s, “form of speech of a region or group,” from Middle French dialecte, from Latin dialectus “local language, way of speaking, conversation,” from Greek dialektos “talk, conversation, speech;” also “the language of a country, dialect,” from dialegesthai “converse with each other,” from dia- “across, between” (see dia-) + legein “speak” (see lecture (n.)).