olemus
(a) muudest erinev üldises tähenduses

Wiktionary:
1. a person or thing situated away from the main body or outside its proper place.

(b) statistikas:
väärtus, mis vea või häiringu tõttu tugevalt erineb
naaberandmete väärtustest,
= in statistics: a data value that differs significantly from other values in a random sample from a population

https://en.wikipedia.org/wiki/Outlier