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[ US /ɹiˈækʃən/ ]
[ UK /ɹɪˈækʃən/ ]
NOUN
  1. an idea evoked by some experience
    his reaction to the news was to start planning what to do
  2. extreme conservatism in political or social matters
    the forces of reaction carried the election
  3. (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
  4. (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
  5. doing something in opposition to another way of doing it that you don't like
    his style of painting was a reaction against cubism
  6. a response that reveals a person's feelings or attitude
    John feared his mother's reaction when she saw the broken lamp
    he was pleased by the audience's reaction to his performance
  7. a bodily process occurring due to the effect of some antecedent stimulus or agent
    his responses have slowed with age
    a bad reaction to the medicine

How To Use reaction In A Sentence

  • The scene near the Chennai Kaliappa Hospital, on Tuesday was supremely ironical, and drew sharp reactions from tree lovers who were passing by.
  • His casual reaction, "you're overreacting," "these things happen, right?" suggests they've gone through this before, with presumably the more recent procedure she discussed with her gyno. Samantha Zalaznick: Mad Men Recap: Help!
  • Meanwhile, doctors have identified still more reactions to stress that can increase our risk of cardiovascular disease. Times, Sunday Times
  • The strength of the argument for splitting the bill is evident in the reaction of the two Republican senators from Texas.
  • But decades of research have gone by and scientists remain incapable of creating a sustainable fusion reaction that could be used to create reliable power.
  • Note the extremes of acidity and alkalinity in which macroscopical growth has developed (Range of reaction). The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.
  • Aliquot 10μ l of the master mix for each DNA to be analyzed into a reaction tube.
  • Allozymes are catalytic RNA- or DNA-based molecules whose ability to catalyze a reaction is modulated by their interaction with an effector molecule.
  • Our reaction to a tickling sensation may have arisen from a defence against creepy-crawlies. Times, Sunday Times
  • The grannom, and the reaction it seems to produce in fish, can prove a head-scratcher. Times, Sunday Times
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