IPA: //ˌsuːpərˈvɛnʃən//
KK: /sʊpərˈvɛnʃən/
The act of something occurring or happening after something else, often in a way that is dependent on it.
The supervention of new regulations changed the way businesses operated.
Supervention is formed from "super-" (meaning above or over) and "venire" (meaning to come). The word describes something that comes upon or occurs in addition to something else, often unexpectedly or as a consequence.
Think of something that comes 'above' ('super-') or 'over' ('venire') another event — that's why supervention means an additional occurrence.