anomaly
US /əˈnɑː.mə.li/
UK /əˈnɑː.mə.li/

1.
異常, 反常, 不規則
something that deviates from what is standard, normal, or expected
:
•
The detected signal was an anomaly, not fitting the expected pattern.
檢測到的信號是一個異常,不符合預期模式。
•
His sudden silence was an anomaly, as he was usually very talkative.
他突然的沉默是一個異常,因為他通常很健談。