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We found 34 dictionaries with English definitions that include the word effectiveness:
Click on the first link on a line below to go directly to a page where "effectiveness" is defined.

General (23 matching dictionaries)

1. effectiveness: Merriam-Webster.com [home, info]
2. effectiveness: Oxford Dictionaries [home, info]
3. effectiveness: Collins English Dictionary [home, info]
4. effectiveness: Vocabulary.com [home, info]
5. Effectiveness, effectiveness: Wordnik [home, info]
6. effectiveness: Cambridge Advanced Learner's Dictionary [home, info]
7. effectiveness: Wiktionary [home, info]
8. Effectiveness, effectiveness: Dictionary.com [home, info]
9. effectiveness: UltraLingua English Dictionary [home, info]
10. effectiveness: Cambridge Dictionary of American English [home, info]
11. Effectiveness: Wikipedia, the Free Encyclopedia [home, info]
12. Effectiveness: Online Plain Text English Dictionary [home, info]
13. effectiveness: Webster's Revised Unabridged, 1913 Edition [home, info]
14. effectiveness: Rhymezone [home, info]
15. Effectiveness: AllWords.com Multi-Lingual Dictionary [home, info]
16. effectiveness: Free Dictionary [home, info]
17. effectiveness: Mnemonic Dictionary [home, info]
18. effectiveness: WordNet 1.7 Vocabulary Helper [home, info]
19. effectiveness: LookWAYup Translating Dictionary/Thesaurus [home, info]
20. effectiveness: Dictionary/thesaurus [home, info]
21. effectiveness: Wikimedia Commons US English Pronunciations [home, info]

Business (2 matching dictionaries)

22. effectiveness: Legal dictionary [home, info]
23. effectiveness: BusinessDictionary.com [home, info]

Computing (2 matching dictionaries)

24. Effectiveness: Cybernetics and Systems [home, info]
25. effectiveness: Encyclopedia [home, info]

Medicine (6 matching dictionaries)

26. Effectiveness: AIDSinfo Glossary [home, info]
27. effectiveness: online medical dictionary [home, info]
28. Effectiveness: GI Disorders [home, info]
29. Effectiveness: Glossary of Medical Education Terms [home, info]
30. Effectiveness: AIDS Medical Glossary and Drug Chart [home, info]
31. effectiveness: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

32. effectiveness: A Brief Critical Dictionary of Education [home, info]

(Note: See effectivity for more definitions.)

Quick definitions from WordNet (effectiveness) ▸ noun:  power to be effective; the quality of being able to bring about an effect ▸ noun:  capacity to produce strong physiological or chemical effects ▸ Also see effectivity ▸ Words similar to effectiveness ▸ Usage examples for effectiveness ▸ Popular adjectives describing effectiveness ▸ Words that often appear near effectiveness ▸ Rhymes of effectiveness ▸ Invented words related to effectiveness