účinnost meaning in English

effectivity [effectivities]▼(a measure of the effectiveness of something)
noun
[UK: ɪfɪktˈɪvɪti] [US: ɪfɪktˈɪvɪɾi]

effectivity [effectivities]▼(the ability or power to be effective)
noun
[UK: ɪfɪktˈɪvɪti] [US: ɪfɪktˈɪvɪɾi]

efficacy [efficacies]▼(ability to produce effect)
noun
[UK: ˈe.fɪk.ə.si] [US: ˈe.fɪˌk.æ.si]

efficiency [efficiencies]▼(extent to which a resource is used for the intended purpose)
noun
[UK: ɪ.ˈfɪʃn.si] [US: ə.ˈfɪ.ʃən.si]