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Audio » Dictionary » E » Effacement ... Egg Fu Yung


Pronunciation (US): 

 Dictionary entry overview: What does efficacy mean? 

  The noun EFFICACY has 1 sense:

1. capacity or power to produce a desired effect

  Familiarity information: EFFICACY used as a noun is very rare.

 Dictionary entry details 


Sense 1efficacy [BACK TO TOP]


Capacity or power to produce a desired effect

Classified under:

Nouns denoting attributes of people and objects


efficaciousness; efficacy

Context example:

concern about the safety and efficacy of the vaccine

Hypernyms ("efficacy" is a kind of...):

effectiveness; effectivity; effectuality; effectualness (power to be effective; the quality of being able to bring about an effect)


efficacious (marked by qualities giving the power to produce an intended effect)

inefficacious (lacking the power to produce a desired effect)


inefficacy (a lack of efficacy)

 Learn English with... Proverbs of the week 
"After a storm comes a calm." (English proverb)

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 EFFICACY: related words searches 

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