If the language you speak in your region is different in vocabulary, grammar and accent than the main form of the language, you speak a dialect. If your cousin in rural Arkansas can't understand your jokes, blame it on differences in dialect.

Both an accent and a dialect contain variations in pronunciation from the standard form of a language. When you speak a dialect, however, you also use different words and grammar, sometimes to such a degree that speakers of the dialect and the standard form of the language have a hard time understanding each other.

Definitions of dialect

n the usage or vocabulary that is characteristic of a specific group of people

“the immigrants spoke an odd dialect of English”
“it has been said that a language is a dialect with an army and navy”
accent, idiom
eye dialect
the use of misspellings to identify a colloquial or uneducated speaker
a regional dialect of a language (especially French); usually considered substandard
Type of:
non-standard speech
speech that differs from the usual accepted, easily recognizable speech of native adult members of a speech community