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We found 41 dictionaries with English definitions that include the word effective:
Click on the first link on a line below to go directly to a page where "effective" is defined.

General (28 matching dictionaries)

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

Business (5 matching dictionaries)

27. Effective: MoneyGlossary.com [home, info]
28. effective: Glossary of Legal Terms [home, info]
29. Effective: Construction Term Glossary [home, info]
30. effective: Legal dictionary [home, info]
31. effective: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

32. effective: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

33. effective: online medical dictionary [home, info]
34. effective: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

35. EFFECTIVE: Navajo Code Talkers' Dictionary [home, info]
36. effective: Sound-Alike Words [home, info]

Science (1 matching dictionary)

37. effective: PlanetMath Encyclopedia [home, info]

Tech (2 matching dictionaries)

38. Effective: AUTOMOTIVE TERMS [home, info]
39. Effective: Heavy construction glossary [home, info]

(Note: See effectivity for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (effective) ▸ adjective:  equipped and ready for service ("The fort was held by about 100 effective soldiers") ▸ adjective:  existing in fact; not theoretical; real ("A decline in the effective demand") ▸ adjective:  able to accomplish a purpose; functioning effectively ("People who will do nothing unless they get something out of it for themselves are often highly effective persons...-G.B.Shaw") ▸ adjective:  exerting force or influence ("The law is effective immediately") ▸ adjective:  producing or capable of producing an intended result or having a striking effect ("An air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation-LewisMumford") ▸ adjective:  works well as a means or remedy ("An effective reprimand") ▸ Also see effectivity ▸ Words similar to effective ▸ Usage examples for effective ▸ Popular nouns described by effective ▸ Words that often appear near effective ▸ Rhymes of effective ▸ Invented words related to effective