olemus
kvalitatiivne lahknevus kehtivast või eeldatavast normist
Wiktionary:
1. a deviation from a rule or from what is regarded as normal; an outlier
Synonyms: abnormality, deviance, deviation, exception, inconsistency, irregularity, phenomenon
2. something or someone that is strange or unusual
3. (sciences) any event or measurement that is out of the ordinary regardless of whether it is exceptional or not
ISO 13372:
ebaregulaarsus või ebanormaalsus süsteemis
= irregularity or abnormality in a system

vt ka
- hälbepõhine avastamine