Definition of efficacy

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< efficacious

efficiency >

ef·fi·ca·cy

(

-k

-s

) KEY

NOUN:

Power or capacity to produce a desired effect; effectiveness.

ETYMOLOGY:
Latin efficcia, from efficx , efficc-, efficacious ; see efficacious

Thesaurus: synonyms for efficacy

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The American Heritage® Dictionary of the English Language, Fourth Edition.
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