aberration

noun [抽象名词]反常现象，异常行为；偏离；行为异常的人；精神失常；畸变；像差；光行差

It became very clear that the incident was not just an aberration; it was not just a single incident.
已经很明确这次事件并不仅仅是一次失常，也不只是一个单独的事件。