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English definition of “catalyst”

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catalyst

noun [C] uk   /ˈkæt.əl.ɪst/ us    /ˈkæt̬-/
specialized chemistry something that makes a chemical reaction happen more quickly without itself being changed an event or person that causes great change: The high suicide rate acted as a catalyst for change in the prison system.
(Definition of catalyst from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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