• An action or statement in response to a stimulus or other event

    "When I last tried to eat strawberries I had a terrible allergic reaction."

  • "You were in the courtroom. What is your reaction?"

    "The announcement of the verdict brought a violent reaction."

  • (chemistry) A transformation in which one or more substances is converted into another by combination or decomposition

    "In this reaction, the acid and base will neutralize each other, producing a salt."

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