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Definitions of reaction
  1. 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"

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  2. noun
    a bodily process occurring due to the effect of some antecedent stimulus or agent
    "a bad reaction to the medicine"

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  3. noun
    an idea evoked by some experience
    "his reaction to the news was to start planning what to do"
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  4. noun
    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"
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  5. 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"
  6. noun
    extreme conservatism in political or social matters
    "the forces of reaction carried the election"
  7. 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"
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Definition that contains reaction
  • transfusion reaction reaction of the body to a transfusion of blood that is not compatible with its own blood; an adverse reaction can range from fever and hives to renal failure and shock and death
  • rocket propulsion reaction propulsion using stored oxygen for combustion; used where there is insufficient atmospheric oxygen
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