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efficacy - Dictionary Entry

efficacy

Part of Speech

Noun

Pronunciation

English (IPA): /ˈɛfɪkəsi/

Definitions

  • The ability to produce a desired or intended result.
  • The power to achieve an effect.

Usage Examples

  • "The efficacy of the new drug was confirmed through clinical trials."
  • "She questioned the efficacy of the new teaching methods."
  • "This vaccine has high efficacy in preventing infections."

Etymology

Derived from Latin efficacia, from efficax ("powerful, effective"), related to efficere ("to accomplish, produce").

Synonyms

  • Effectiveness
  • Potency
  • Efficiency
  • Capability
  • Success

Antonyms

  • Ineffectiveness
  • Failure
  • Weakness
  • Incapacity
  • Uselessness

Translations

Language Translation Pronunciation
Spanish eficacia /efiˈkaθja/
French efficacité /e.fi.ka.si.te/
German Wirksamkeit /ˈvɪʁkzaːmkaɪt/
Russian эффективность (effektivnost') /ɪfʲɪkˈtʲivnəsʲtʲ/
Chinese (Mandarin) 效能 (xiàonéng) /ɕjâʊnə̌ŋ/
Hindi प्रभावशीलता (prabhavsheelta) /pɾəbʰaːʋʃiːlta/

Regional Pronunciation Variations

  • British English: /ˈɛfɪkəsi/
  • American English: /ˈɛfəkəsi/

Historical Usage

The word "efficacy" has been in use since the 16th century and has been commonly applied in medical, legal, and scientific texts.

Cultural Nuances

In modern discourse, "efficacy" is particularly used in scientific, medical, and policy discussions to measure the effectiveness of treatments, drugs, and interventions.

More Information

"Efficacy" is distinguished from "effectiveness" in medical and scientific contexts, where efficacy refers to the ability of a treatment to work under ideal conditions, while effectiveness describes its performance in real-world situations.

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