The ratio of the energy delivered (or work done) by a machine to the energy needed (or work required) in operating the machine. The efficiency of any machine is always less than one due to forces such as friction that use up energy unproductively.
The state or quality of being potent, or the degree of this; power; strength
Intensity of emotion or belief:
Find another word for effectiveness. In this page you can discover 25 synonyms, antonyms, idiomatic expressions, and related words for effectiveness, like: ineffectiveness, uselessness, unproductivity, effect, effectuality, effectualness, efficaciousness, efficiency, influence, affect and potency.