olemus
talitlust puudutav

Merriam-Webster, adj:
1a: of, connected with, or being a function
//the functional differences between the departments
1b: affecting physiological or psychological functions but not organic structure
//functional heart disease

näiteid
functional currency -- töövaluuta; kohalik vääring
functional diagram -- talitlusskeem
functional manager -- talitlusjuht
functional responsibility -- tööalane vastutus
functional risk -- talitlusrisk
functional testing -- talitluse testimine