Oxford Advanced American Dictionary

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

dialect

noun
dialect pronunciation English ˈdaɪəlekt dialect pronunciation American ˈdaɪəlekt
[countable, uncountable]
 
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 dialectdialect words/expressions compare accent, idiolectdialectal
dialectal pronunciation English ˌdaɪəˈlektl dialectal pronunciation American ˌdaɪəˈlektl
adjectiveThere are dialectal differences from one area of the country to another.