IPA: //əˈhɪstərɪkəl//
KK: /əˈhɪstərɪkəl/
Not related to or concerned with history or historical events; lacking historical context or accuracy.
The film was criticized for its ahistorical portrayal of the events.
Ahistorical → It is formed from "a-" (meaning not or without) and "historical" (from Greek "historikos", meaning relating to history). The word "ahistorical" means not relating to history or lacking historical context.
Think of 'not' ('a-') relating to 'history' ('historical') — that's why ahistorical means something that does not connect to history.