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Definition effectiveness (the ability to produce a desired result)
  • The doctor weighed the efficacy of each treatment against potential side-effects.
efficacy = effectiveness
  • They held hearings to investigate concerns about the safety and efficacy of the vaccine.
  • efficacy = effectiveness
  • Man had marked this woman's sin by a scarlet letter, which had such potent and disastrous efficacy that no human sympathy could reach her, save it were sinful like herself.
    Nathaniel Hawthorne  --  The Scarlet Letter
  • efficacy = effectiveness
  • It soon proved its efficacy, and redeemed the leech's pledge.
    Nathaniel Hawthorne  --  The Scarlet Letter
  • efficacy = effectiveness
  • It was impossible to doubt that, whatever painful efficacy there might be in the secret sting of remorse, a deadlier venom had been infused into it by the hand that proffered relief.
    Nathaniel Hawthorne  --  The Scarlet Letter
  • efficacy = effectiveness
  • Souls, it is said, more souls than one, were brought to the truth by the efficacy of that sermon, and vowed within themselves to cherish a holy gratitude towards Mr. Dimmesdale throughout the long hereafter.
    Nathaniel Hawthorne  --  The Scarlet Letter
  • efficacy = effectiveness
  • The good woman no sooner felt the gold within her palm, than her temper began (such is the efficacy of that panacea) to be mollified.
    Fielding, Henry  --  The History of Tom Jones, a Foundling
  • I wonder who first discovered the efficacy of poetry in driving away love
    Austen, Jane  --  Pride and Prejudice
  • ...the word acquires, through association, some of the same causal efficacy as the object.
    Russell, Bertrand  --  The Analysis of Mind
  • Like most savages they are firm believers in dreams, and in the power and efficacy of charms and amulets, or medicines as they term them.
    Irving, Washington  --  The Adventures of Captain Bonneville, U.S.A., in the Rocky Mountains and the far West
  • The very mysteriousness of such a cure made her the more confident of its efficacy.
    Edith Wharton  --  The Age of Innocence
  • Now, I say, is the time when the virtue that is in thee is ripe, and endowed with efficacy to work the good that is looked for from thee.
    Miguel de Cervantes  --  Don Quixote
  • Behold! there is a medicine, potent, as a wise physician has assured me, and almost divine in its efficacy.
    Nathaniel Hawthorne  --  Rappaccini's Daughter
  • I have confidence in the remedy I propose, and only ask you to permit me to assure you of its efficacy.
    Alexandre Dumas  --  The Count of Monte Cristo
  • But questions about the painlessness and efficacy of lethal injection were emerging.
    Bryan Stevenson  --  Just Mercy
  • Hivert openly cast some doubt on the efficacy of it.
    Gustave Flaubert  --  Madame Bovary
  • This total failure of the coal-hole discipline shook Silas's belief in the efficacy of punishment.
    George Eliot  --  Silas Marner
  • I have never believed in the efficacy of idealists-have you? and this is no age for impractical idealism.
    Ayn Rand  --  Atlas Shrugged
  • This apprehension had not been without efficacy in determining me to summary means.
    Herman Melville  --  Bartleby, the Scrivener: a Story of Wall Street
  • He gave the facts with flat efficacy.
    Dan Brown  --  Angels & Demons

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