olemus
iseloomulik eristav joon, näiteks biomeetrik

Wiktionary:
1. (biology, psychology) an identifying characteristic, habit or trend
Synonym: characteristic

näiteid
https://en.wikipedia.org/wiki/Phenotypic_trait
https://en.wikipedia.org/wiki/Trait_theory
https://openpress.usask.ca/introductiontopsychology/chapter/personality-traits/

metric trait -- kvantitatiivne tunnus
personality trait -- iseloomujoon