Question

what phrase best defines dialect 1. the set of slang terms in a language 2.a manner of conversation that contains no idioms 3. rules relating spelling and pronunciation 4. a regional or social variant of a language

Answer 1

The phrase that best defines dialect would be 4. a regional or social variant of a language. For example, a person with a Midwestern American dialect would call a carbonated sugar beverage "pop" whereas a person with a New England American dialect would refer to the same beverage as "soda."

Answer 2

4. a regional or social variant of a language