1. A variety of a language that is distinguished by grammar, vocabulary, and pronunciation, typically used by a particular group or in a particular region
The regional dialect of that area is quite distinct from standard Portuguese.
O dialeto regional dessa área é bastante distinto do português padrão.
2. A form of speech characteristic of a particular social class or group
The working-class dialect differs significantly from formal speech.
O dialeto da classe trabalhadora difere significativamente da fala formal.