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.

standard English dialect example
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.

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Grammar and usage