dialect

noun
  1. A particular form of a language that is peculiar to a specific region or social group, often distinguished by its vocabulary, grammar, and pronunciation. noun
    The Appalachian dialect is known for its unique vocabulary and pronunciation.
    She could easily switch between her native dialect and standard English.
  2. 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. noun
    The Cockney dialect is associated with working-class Londoners.
    Linguists study dialects to understand how languages evolve over time.