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We found 48 dictionaries with English definitions that include the word efficacy:
Click on the first link on a line below to go directly to a page where "efficacy" is defined.

General dictionaries General (29 matching dictionaries)
  1. efficacy: Dictionary/thesaurus [home, info]
  2. efficacy: LookWAYup Translating Dictionary/Thesaurus [home, info]
  3. efficacy: WordNet 1.7 Vocabulary Helper [home, info]
  4. efficacy: Mnemonic Dictionary [home, info]
  5. efficacy: Free Dictionary [home, info]
  6. efficacy: Webster's 1828 Dictionary [home, info]
  7. Efficacy: AllWords.com Multi-Lingual Dictionary [home, info]
  8. efficacy: Rhymezone [home, info]
  9. efficacy: Webster's Revised Unabridged, 1913 Edition [home, info]
  10. Efficacy: Online Plain Text English Dictionary [home, info]
  11. Efficacy, Efficacy (pharmacology): Wikipedia, the Free Encyclopedia [home, info]
  12. efficacy: UltraLingua English Dictionary [home, info]
  13. efficacy: Online Etymology Dictionary [home, info]
  14. efficacy, Efficacy: Dictionary.com [home, info]
  15. efficacy: Infoplease Dictionary [home, info]
  16. efficacy: The Wordsmyth English Dictionary-Thesaurus [home, info]
  17. efficacy: V2 Vocabulary Building Dictionary [home, info]
  18. efficacy: Webster's New World College Dictionary, 4th Ed. [home, info]
  19. efficacy: Wiktionary [home, info]
  20. efficacy: Cambridge Advanced Learner's Dictionary [home, info]
  21. efficacy, Efficacy: Wordnik [home, info]
  22. efficacy: Macmillan Dictionary [home, info]
  23. efficacy: Vocabulary.com [home, info]
  24. efficacy: Collins English Dictionary [home, info]
  25. efficacy: American Heritage Dictionary of the English Language [home, info]
  26. efficacy: Oxford Dictionaries [home, info]
  27. efficacy: Merriam-Webster.com [home, info]

Art dictionaries Art (1 matching dictionary)
  1. Efficacy: Health & Beauty Glossary [home, info]

Business dictionaries Business (2 matching dictionaries)
  1. efficacy: BusinessDictionary.com [home, info]
  2. efficacy: Legal dictionary [home, info]

Medicine dictionaries Medicine (12 matching dictionaries)
  1. efficacy: Medical dictionary [home, info]
  2. efficacy: Glossary of HIV/AIDS Related Terms [home, info]
  3. efficacy: Dictionary of Cancer Terms [home, info]
  4. Efficacy: AIDS Medical Glossary and Drug Chart [home, info]
  5. Efficacy: Glossary of Medical Education Terms [home, info]
  6. Efficacy: GI Disorders [home, info]
  7. Efficacy: Hepatitis C Information Central [home, info]
  8. Efficacy: Hair Facts [home, info]
  9. EFFICACY: Lay Terms for Consent Forms [home, info]
  10. Efficacy: Glossary of Terms Used in Medicinal Chemistry [home, info]
  11. efficacy: online medical dictionary [home, info]
  12. Efficacy: AIDSinfo Glossary [home, info]

Science dictionaries Science (1 matching dictionary)
  1. Efficacy: Medicinal Chemistry [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. efficacy: Urban Dictionary [home, info]

Tech dictionaries Tech (2 matching dictionaries)
  1. Efficacy: Glossary of Energy Terms [home, info]
  2. Efficacy: Beauty & Health Glossary [home, info]

(Note: See efficacies for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (efficacy)

noun:  capacity or power to produce a desired effect ("Concern about the safety and efficacy of the vaccine")

▸ Also see efficacies
Word origin

Words similar to efficacy

Usage examples for efficacy

Popular adjectives describing efficacy

Words that often appear near efficacy

Rhymes of efficacy

Invented words related to efficacy

Phrases that include efficacy:   animal efficacy rule, business efficacy test, technological self efficacy, vaccine efficacy, work self efficacy more...

Words similar to efficacy:   efficaciousness, efficacies, more...

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