1. (power to be effective
the quality of being able to bring about an effect)
skuteczność, celność, efektywność
synonim: effectiveness
synonim: effectualness
synonim: effectuality

2. (power to be effective
the quality of being able to bring about an effect)
efektywność, wydajność: : synonim: effectiveness
synonim: effectualness
synonim: effectuality