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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 (31 matching dictionaries)

1. reaction: Merriam-Webster.com [home, info]
2. reaction: Oxford Learner's 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 (chemistry), Reaction (physics), Reaction (song), Reaction, The Reaction (Animorphs), The Reaction (novel), The Reaction, (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 (12 matching dictionaries)

30. Reaction: MoneyGlossary.com [home, info]
31. reaction: INVESTORWORDS [home, info]
32. Reaction: bizterms.net [home, info]
33. Reaction: Bloomberg Financial Glossary [home, info]
34. Reaction: Construction Term Glossary [home, info]
35. Reaction: Harvey Financial [home, info]
36. Reaction, Reaction: Futures and Options Market Terminology [home, info]
37. Reaction: Investopedia [home, info]
38. reaction: Legal dictionary [home, info]
39. Reaction: Financial dictionary [home, info]
40. reaction: BusinessDictionary.com [home, info]
41. Reaction: WashingtonPost.com: Business [home, info]

Computing (1 matching dictionary)

42. reaction: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

43. reaction: online medical dictionary [home, info]
44. reaction: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

45. reaction: Idioms [home, info]

Science (4 matching dictionaries)

46. Reaction: Misunderstood Physics Terms [home, info]
47. reaction: PHYSICAL ORGANIC CHEMISTRY [home, info]
48. Reaction: Physic and Astronomy Glossary [home, info]
49. Reaction: NRC Glossary of Nuclear Terms -- [home, info]

Slang (1 matching dictionary)

50. reaction: Urban Dictionary [home, info]

Tech (1 matching dictionary)

51. Reaction: AUTOMOTIVE TERMS [home, info]

(Note: See reactions for more definitions.)

Quick definitions from Macmillan ( ) Provided by 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") ▸ Also see reactions ▸ Word origin ▸ Words similar to reaction ▸ Usage examples for reaction ▸ Idioms related to reaction (New!) ▸ Popular adjectives describing reaction ▸ Words that often appear near reaction ▸ Rhymes of reaction ▸ Invented words related to reaction