efficacy

Efficacy is defined as the ability to do what is defined as desired or to be effective at producing a result.

(noun)

An example of efficacy is when a crime bill is effective at stopping crime.

See efficacy in Webster's New World College Dictionary

noun

power to produce effects or intended results; effectiveness

Origin: ME & OFr efficace < L efficacia < efficax: see efficacious

See efficacy in American Heritage Dictionary 4

noun

Power or capacity to produce a desired effect; effectiveness.

Origin:

Origin: Latin efficācia

Origin: , from efficāx, efficāc-, efficacious; see efficacious

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