Efficacy vs. Efficiency

Efficacynoun

Ability to produce a desired effect under ideal testing conditions.

Efficacynoun

Degree of ability to produce a desired effect.

Efficacynoun

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.

Efficacynoun

capacity or power to produce a desired effect;

Efficacynoun

the ability to produce a desired or intended result

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.

Efficiencynoun

The extent to which time is well used for the intended task.

Efficiencynoun

(dated) The quality of producing an effect or effects.

Efficiencynoun

The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended.

Efficiencynoun

A one-room apartment.

Efficiencynoun

the ratio of the output to the input of any system

Efficiencynoun

skillfulness in avoiding wasted time and effort;

Efficiency

Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.