A dialect is a nonstandard form of language that is used in a particular local region. it's best to avoid regional terms in formal writing—for example, Americans in the Pacific Northwest may not be familiar with terms commonly used in the Southeast, and so they may not understand them, or they may unfairly interpret them as ignorance.
Here are some examples of dialect words included in the New Oxford American Dictionary.
|against||agin||Whatever she says, I'm agin it.|
|correctly||aright||Did I hear that aright?|
|around||along about||He generally leaves along about daylight.|
|asparagus||sparrowgrass||We cooked up a bunch of young sparrowgrass.|
|creek||crick||It was by a crick in Bixby Canyon.|
|sit||set||Just set there and wait your turn.|