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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 (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 (1 matching dictionary)

28. Efficacy: Health & Beauty Glossary [home, info]

Business (2 matching dictionaries)

29. efficacy: BusinessDictionary.com [home, info]
30. efficacy: Legal dictionary [home, info]

Medicine (12 matching dictionaries)

31. efficacy: Medical dictionary [home, info]
32. efficacy: Glossary of HIV/AIDS Related Terms [home, info]
33. efficacy: Dictionary of Cancer Terms [home, info]
34. Efficacy: AIDS Medical Glossary and Drug Chart [home, info]
35. Efficacy: Glossary of Medical Education Terms [home, info]
36. Efficacy: GI Disorders [home, info]
37. Efficacy: Hepatitis C Information Central [home, info]
38. Efficacy: Hair Facts [home, info]
39. EFFICACY: Lay Terms for Consent Forms [home, info]
40. Efficacy: Glossary of Terms Used in Medicinal Chemistry [home, info]
41. efficacy: online medical dictionary [home, info]
42. Efficacy: AIDSinfo Glossary [home, info]

Science (1 matching dictionary)

43. Efficacy: Medicinal Chemistry [home, info]

Slang (1 matching dictionary)

44. efficacy: Urban Dictionary [home, info]

Tech (2 matching dictionaries)

45. Efficacy: Glossary of Energy Terms [home, info]
46. Efficacy: Beauty & Health Glossary [home, info]

(Note: See efficacies for more definitions.)

Quick definitions from Macmillan ( ) Provided by 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