Definition of efficacy

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  • efficacy is a valid Scrabble US word with a point value of 21
  • efficacy is a valid Scrabble UK word with a point value of 21
  • efficacy is a valid Words with friends word with a point value of 22

Definition of efficacy

  • capacity or power to produce a desired effect (noun)

    Examples

    1. concern about the safety and efficacy of the vaccine

    Synonyms

    1. efficaciousness

See definition of efficacy in Merriam Webster