ac·ro·lect 
(ăkrə-lĕkt′)
(ăkrə-lĕkt′)n.
The variety of speech that is closest to a standard prestige language, especially in an area in which a creole is spoken. For example, Standard Jamaican English is the acrolect where Jamaican Creole is spoken.
[ACRO- + (DIA)LECT.]
ac′ro·lectal adj.