IPA: /ˌpriːtərˈnætʃərəli/
KK: /ˈpriːtərˌnætʃərəli/
In a way that is beyond what is natural or normal; unusually or extraordinarily.
The child seemed to understand the complex concepts preternaturally well for her age.
Preternaturally → It is formed from "praeter-" (meaning beyond or outside) and "naturalis" (meaning natural). The word describes something that exists beyond the natural order or is extraordinary.
Think of something that exists 'beyond' ('praeter-') what is 'natural' ('naturalis') — that's why preternaturally refers to something extraordinary.