IPA: //nɒnˈhɪstərɪkəl//
KK: /nɑnˈhɪstərɪkəl/
Not related to history or historical events.
The museum has a section dedicated to nonhistorical artifacts that showcase modern art.
Nonhistorical → It is formed from "non-" (meaning not) and "historical" (from Greek "historikos", meaning relating to history). The word "nonhistorical" means not relating to history or not based on historical facts.
Think of 'not' ('non-') relating to 'history' ('historical') — that's why nonhistorical means something that does not relate to history.