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Definitions of reaction

  1. (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" Scrapingweb Dictionary DB
  2. a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine"; "his responses have slowed with age" Scrapingweb Dictionary DB
  3. an idea evoked by some experience; "his reaction to the news was to start planning what to do" Scrapingweb Dictionary DB
  4. extreme conservatism in political or social matters; "the forces of reaction carried the election" Scrapingweb Dictionary DB
  5. a response that reveals a person's feelings or attitude; "he was pleased by the audience's reaction to his performance"; "John feared his mother's reaction when she saw the broken lamp" Scrapingweb Dictionary DB
  6. (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" Scrapingweb Dictionary DB
  7. A regular or characteristic response to a stimulation of the nerves. Webster Dictionary DB
  8. A test for typhoid fever based on the fact that blood serum of one affected, in a bouillon culture of typhoid bacilli, causes the bacilli to agglutinate and lose their motility. Webster Dictionary DB
  9. Any action in resisting other action or force; counter tendency; movement in a contrary direction; reverse action. Webster Dictionary DB
  10. The mutual or reciprocal action of chemical agents upon each other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame. Webster Dictionary DB
  11. An action induced by vital resistance to some other action; depression or exhaustion of vital force consequent on overexertion or overstimulation; heightened activity and overaction succeeding depression or shock. Webster Dictionary DB
  12. The force which a body subjected to the action of a force from another body exerts upon the latter body in the opposite direction. Webster Dictionary DB
  13. Backward tendency or movement after revolution, reform, or great progress in any direction. Webster Dictionary DB
  14. Return action or influence; response to influence or effort exerted; a return to a former or opposite state of things; contrary action following the effects of other action; the equal force that a body exerts on an opposing force; chemical change; a chemical process or its result. The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919.
  15. Action following and contrary to previous action; mutual action. The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894.
  16. Reactive, reactionary. The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894.
  17. Reverse or return action. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  18. The mutual action of chemical agents, or its result. The Concise Standard Dictionary of the English Language. By James Champlin Fernald. Published 1919.
  19. Counteraction; reciprocal action; action in the contrary, specially backward, direction. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
  20. The resistance made by a body to the action or impulse of another body; an action or force arising in opposition to another which has preceded. Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.

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Usage examples for reaction

  1. He saw, too, with profound sorrow, unmistakable signs everywhere of reaction in religion, politics, society. – Herbert Spencer by J. Arthur Thomson
  2. Then presently a reaction would set in, and he would be seized with remorse. – Mark Twain, A Biography, 1835-1910, Complete The Personal And Literary Life Of Samuel Langhorne Clemens by Albert Bigelow Paine Last Updated: February 20, 2009
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