Usually means: Achieving desired results successfully, efficiently.
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We found 37 dictionaries that define the word effective:

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

Business (5 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Glossary of Legal Terms (No longer online)
  3. Construction Term Glossary (No longer online)
  4. effective: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. effective: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. effective: Medical dictionary

Miscellaneous (2 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. Sound-Alike Words (No longer online)

Science (1 matching dictionary)
  1. effective: PlanetMath Encyclopedia

Tech (2 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. Heavy construction glossary (No longer online)

(Note: See effectiveness as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Having the power to produce a required effect or effects.
adjective:  Producing a decided or decisive effect.
adjective:  Efficient, serviceable, or operative, available for useful work.
adjective:  Actually in effect.
adjective:  (geometry, of a cycle or divisor) Having no negative coefficients.
adjective:  (algebra, of a group action) Such that no group element acts trivially.
adjective:  (physics, for any effective theory) approximate; Not describing the fundamental dynamic changes in some system as they happen.
noun:  (military) a soldier fit for duty

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