EFFICACY - meaning and definition. What is EFFICACY
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What (who) is EFFICACY - definition

ABILITY TO PERFORM A TASK TO A SATISFACTORY OR EXPECTED DEGREE
Ideal use; Perfect use; Typical use; Efficacious; Drug effect; Clinical effectiveness; Clinical efficacy

efficacy         
n.
Potency, competency, power, strength, force, efficiency, effectiveness, energy, vigor, virtue.
efficacy         
If you talk about the efficacy of something, you are talking about its effectiveness and its ability to do what it is supposed to. (FORMAL)
Recent medical studies confirm the efficacy of a healthier lifestyle.
N-UNCOUNT: usu with poss
Efficacy         
·noun Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer.

Wikipedia

Efficacy

Efficacy is the ability to perform a task to a satisfactory or expected degree. The word comes from the same roots as effectiveness, and it has often been used synonymously, although in pharmacology a distinction is now often made between efficacy and effectiveness.

The word efficacy is used in pharmacology and medicine to refer both to the maximum response achievable from a pharmaceutical drug in research settings, and to the capacity for sufficient therapeutic effect or beneficial change in clinical settings.

Examples of use of EFFICACY
1. It demonstrated statistically significant efficacy, Dermipsor says.
2. In developed countries, the realization that economic efficacy often does not equal social efficacy led to the development of non–profit organizations.
3. "There is no question about its efficacy," Mofaz said.
4. Does this disturb Obama‘s serenity about the efficacy of diplomacy?
5. Testing the efficacy of painkillers is an obvious example.