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English definition of “react”

react

verb [I]     /riˈækt/
B2 to act in a particular way as a direct result of something else : She slapped him and called him names , but he didn't react. The judge reacted angrily to the suggestion that it hadn't been a fair trial . Many people react ( badly ) to (= are made ill by) penicillin .Reacting and responding chemistry to change in a physical or chemical way when put with another substance : Potassium reacts with water .
(Definition of react verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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