A mesolect is a register of spoken language whose character falls somewhere between the prestige of the acrolect and the informality of the basilect. Mesolectic speech, where it is distinguished from acrolectic speech, is often the most widely spoken form of a language, generally being used by the middle class. In linguistics, a register is a subset of a language used for a particular purpose or in a particular social setting. ... An acrolect is a register of a language that is considered formal and high style. ... In linguistics, a basilect is a term for dialects of speech which have diverged so far from the standard language that in essence they have become a different language. ... The middle class (or middle classes) comprises a social group once defined by exception as an intermediate social class between the nobility and the peasantry. ...