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efficacy
used in Sense and Sensibility

only 1 use
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Definition
effectiveness (the ability to produce a desired result)
  • ...a book in her hand, which she was unable to read, or in lying, weary and languid, on a sofa, did not speak much in favour of her amendment; and when, at last, she went early to bed, more and more indisposed, Colonel Brandon was only astonished at her sister's composure, who, though attending and nursing her the whole day, against Marianne's inclination, and forcing proper medicines on her at night, trusted, like Marianne, to the certainty and efficacy of sleep, and felt no real alarm.
    Chapter 43 (3% in)

There are no more uses of "efficacy" in Sense and Sensibility.

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