Usually means: Act against to reduce effect.
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We found 28 dictionaries that define the word counteract:

General (25 matching dictionaries)
  1. counteract: Merriam-Webster.com
  2. counteract: Oxford Learner's Dictionaries
  3. counteract: American Heritage Dictionary of the English Language
  4. counteract: Collins English Dictionary
  5. counteract: Cambridge Advanced Learner's Dictionary
  6. counteract: Wiktionary
  7. counteract: Webster's New World College Dictionary, 4th Ed.
  8. counteract: The Wordsmyth English Dictionary-Thesaurus
  9. counteract: Infoplease Dictionary
  10. counteract: Dictionary.com
  11. counteract: Online Etymology Dictionary
  12. counteract: Cambridge Essential American English Dictionary
  13. Counteract: Online Plain Text English Dictionary
  14. counteract: Webster's Revised Unabridged, 1913 Edition
  15. counteract: Rhymezone
  16. Counteract: AllWords.com Multi-Lingual Dictionary
  17. counteract: Webster's 1828 Dictionary
  18. counteract: Free Dictionary
  19. counteract: Mnemonic Dictionary
  20. counteract: Dictionary/thesaurus
  21. counteract: Wordnik
  22. counteract: Vocabulary.com
  23. Counteract: Wordnik

Business (1 matching dictionary)
  1. counteract: Legal dictionary

Computing (1 matching dictionary)
  1. counteract: Encyclopedia

Medicine (1 matching dictionary)
  1. counteract: Medical dictionary

(Note: See counteracted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  An action performed in opposition to another action.
verb:  (transitive) To have a contrary or opposing effect or force on someone or something.
verb:  (transitive) To deliberately act in opposition to, to thwart or frustrate.

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