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, esp. 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

accent , argot , cant , idiom , jargon , language , lingo , localism , patois , patter , pronunciation , provincialism , regionalism , slang , terminology , tongue , vernacular , vocabularynotes:a dialect is geographical or social variety of speech , whereas dialectic is a form of reasoning or argumentation that focuses on resolving contradictions , speech , lexicon , vocabulary , colloquialism