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We found 53 dictionaries with English definitions that include the word reaction:
Click on the first link on a line below to go directly to a page where "reaction" is defined.

General dictionaries General (31 matching dictionaries)
  1. reaction: Merriam-Webster.com [home, info]
  2. reaction: Oxford Dictionaries [home, info]
  3. reaction: American Heritage Dictionary of the English Language [home, info]
  4. reaction: Collins English Dictionary [home, info]
  5. reaction: Vocabulary.com [home, info]
  6. reaction: Macmillan Dictionary [home, info]
  7. Reaction, reaction: Wordnik [home, info]
  8. reaction: Cambridge Advanced Learner's Dictionary [home, info]
  9. Reaction: Wiktionary [home, info]
  10. reaction: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. reaction: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. reaction: Infoplease Dictionary [home, info]
  13. reaction: Dictionary.com [home, info]
  14. reaction: Online Etymology Dictionary [home, info]
  15. reaction: UltraLingua English Dictionary [home, info]
  16. reaction: Cambridge Dictionary of American English [home, info]
  17. reaction: Cambridge International Dictionary of Idioms [home, info]
  18. Reaction (The Spectacular Spider-Man), Reaction (album), Reaction (disambiguation), Reaction (physics), Reaction (song), Reaction, The Reaction (Animorphs), The Reaction (Animorphs TV Episode), (n-p) reaction: Wikipedia, the Free Encyclopedia [home, info]
  19. Reaction: Online Plain Text English Dictionary [home, info]
  20. reaction: Webster's Revised Unabridged, 1913 Edition [home, info]
  21. reaction: Rhymezone [home, info]
  22. reaction: AllWords.com Multi-Lingual Dictionary [home, info]
  23. reaction: Webster's 1828 Dictionary [home, info]
  24. reaction: Free Dictionary [home, info]
  25. reaction: Mnemonic Dictionary [home, info]
  26. reaction: WordNet 1.7 Vocabulary Helper [home, info]
  27. reaction: LookWAYup Translating Dictionary/Thesaurus [home, info]
  28. reaction: Dictionary/thesaurus [home, info]
  29. reaction: Wikimedia Commons US English Pronunciations [home, info]

Business dictionaries Business (12 matching dictionaries)
  1. Reaction: MoneyGlossary.com [home, info]
  2. reaction: INVESTORWORDS [home, info]
  3. Reaction: bizterms.net [home, info]
  4. Reaction: Bloomberg Financial Glossary [home, info]
  5. Reaction: Construction Term Glossary [home, info]
  6. Reaction: Harvey Financial [home, info]
  7. Reaction, Reaction: Futures and Options Market Terminology [home, info]
  8. Reaction: Investopedia [home, info]
  9. reaction: Legal dictionary [home, info]
  10. Reaction: Financial dictionary [home, info]
  11. reaction: BusinessDictionary.com [home, info]
  12. Reaction: WashingtonPost.com: Business [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. reaction: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. reaction: online medical dictionary [home, info]
  2. reaction: Medical dictionary [home, info]

Miscellaneous dictionaries Miscellaneous (1 matching dictionary)
  1. reaction: Idioms [home, info]

Science dictionaries Science (4 matching dictionaries)
  1. Reaction: Misunderstood Physics Terms [home, info]
  2. reaction: PHYSICAL ORGANIC CHEMISTRY [home, info]
  3. Reaction: Physic and Astronomy Glossary [home, info]
  4. Reaction: NRC Glossary of Nuclear Terms -- [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. reaction: Urban Dictionary [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. Reaction: AUTOMOTIVE TERMS [home, info]

Quick definitions from Macmillan (
American English Definition British English Definition

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Quick definitions from WordNet (reaction)

noun:  doing something in opposition to another way of doing it that you don't like ("His style of painting was a reaction against cubism")
noun:  a bodily process occurring due to the effect of some foregoing stimulus or agent ("A bad reaction to the medicine")
noun:  an idea evoked by some experience ("His reaction to the news was to start planning what to do")
noun:  extreme conservatism in political or social matters ("The forces of reaction carried the election")
noun:  a response that reveals a person's feelings or attitude ("He was pleased by the audience's reaction to his performance")
noun:  (mechanics) the equal and opposite force that is produced when any force is applied to a body ("Every action has an equal and opposite reaction")
noun:  (chemistry) a process in which one or more substances are changed into others ("There was a chemical reaction of the lime with the ground water")

Word origin

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Phrases that include reaction:   nuclear reaction, reaction turbine, adverse reaction, delayed reaction, wassermann reaction, more...

Words similar to reaction:   response, chemical reaction, more...

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