Sentence:  The highest level of good English has been called the acrolect; the lowest level of poor speech, the basilect; both are contrasted with the <WSD>matrilect</WSD>, the general native language. 
Meaning of the word marked with <WSD> tags:  The language of the dominant local culture, in the situation where a pidgin or creole is formed from the language of the dominant culture and another outside introduced language.