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

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

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

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

Search for efficacy on Google or Wikipedia

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