|Definition - A terminal combining form that is commonly used in linguistics (1) to indicate a social or regional variety (e.g. idiolect) and (2) to form linguistic technical terms (e.g. acrolect).|
Etymology - It derives from the word dialect.
Oxford English Dictionary - The combining form's first citation is from 1965:
"I will refer to this topmost dialect in the local sociolinguistic hierarchy as acrolect (from acro- ‘apex’ plus -lect as in dialect). …."
(W. A. Stewart in R. W. Shuy Social Dial. & Lang. Learning 15)