aberration
noun [ C or U ] formal uk/ˌæb.əˈreɪ.ʃən/ us/ˌæb.əˈreɪ.ʃən/
（暂时的）脱离常规；反常现象；异常行为
a temporary change from the typical or usual way of behaving
mental aberration I'm sorry I'm late - I had a mental aberration and forgot we had a meeting today. 对不起，我迟到了。我一时糊涂，竟然忘了今天有会。
In a moment of aberration, she agreed to go with him. 她一反常态，竟然答应跟他一起去了。
The misconduct was an aberration from the norm for him.