Definition of dialect noun from the Oxford Advanced Learner's Dictionary

 

dialect

 noun
noun
BrE BrE//ˈdaɪəlekt//
 
; NAmE NAmE//ˈdaɪəlekt//
 
[countable, uncountable]
 
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the form of a language that is spoken in one area with grammar, words and pronunciation that may be different from other forms of the same language the Yorkshire dialect dialect words/expressions compare accent, idiolect Wordfinderaccent, alphabet, dialect, grammar, language, literacy, literature, pronunciation, translate, word Word Origin mid 16th cent. (denoting the art of investigating the truth of opinions): from French dialecte, or via Latin from Greek dialektos ‘discourse, way of speaking’, from dialegesthai ‘converse with’, from dia ‘through’ + legein ‘speak’.Extra examples All languages and dialects change over time. She spoke in broad Yorkshire dialect. The poet uses a variety of Scots dialect words and expressions.
See the Oxford Advanced American Dictionary entry: dialect