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

1.
anomalia, irregolarità, deviazione
something that deviates from what is standard, normal, or expected
:
•
The detected signal was an anomaly, not fitting the expected pattern.
Il segnale rilevato era un'anomalia, non corrispondente al modello atteso.
•
His sudden silence was an anomaly, as he was usually very talkative.
Il suo improvviso silenzio era un'anomalia, dato che di solito era molto loquace.