reaction - Dictionary definition and pronunciation - Yahoo! Education

Definition of reaction

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re·ac·tion  audio  (r-kshn) KEY 

NOUN:
    1. A response to a stimulus.
    2. The state resulting from such a response.
  2. A reverse or opposing action.
    1. A tendency to revert to a former state.
    2. Opposition to progress or liberalism; extreme conservatism.
  4. Chemistry A change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances.
  5. Physics A nuclear reaction.
  6. Physics An equal and opposite force exerted by a body against a force acting upon it.
  7. The response of cells or tissues to an antigen, as in a test for immunization.



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