noun (n)

• the usage or vocabulary that is characteristic of a specific group of people(noun.communication)

  Example:
  The immigrants spoke an odd dialect of English.
  It has been said that a language is a dialect with an army and navy.
  

  Synonym:
  accent, idiom
  

  source: wordnet30
• Means or mode of expressing thoughts; language; tongue; form of speech.(noun)

  source: webster1913