definitions

efficacy

[ ef-i-kuh-see ]
/ ˈɛf ɪ kə si /
SEE MORE SYNONYMS FOR efficacy ON THESAURUS.COM

noun, plural ef·fi·ca·cies.

capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy.

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RELATED WORDS

adequacy, effectiveness, competence, virtue, potency, vigor, use, strength, force, ability, power, efficaciousness, energy, influence, effect, weight, capability, performance, success, sufficiency

Nearby words

effervescent, effervescent salt, effete, efficacious, efficacity, efficacy, efficiency, efficiency apartment, efficiency expert, efficient, efficient cause

Origin of efficacy

1520–30; < Latin efficācia, equivalent to efficāc- (see efficacious) + -ia -y3

Related forms

non·ef·fi·ca·cy, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for efficacies

efficacy

/ (ˈɛfɪkəsɪ) /

noun

the quality of being successful in producing an intended result; effectiveness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012