American English

Definition of catalyst noun from the Oxford Advanced American Dictionary



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  1. 1(chemistry) a substance that makes a chemical reaction happen faster without being changed itself Chlorine will act as a catalyst.
  2. 2catalyst (for something) a person or thing that causes a change I see my role as being a catalyst for change. The riots were later seen as the catalyst for the new political developments.
See the Oxford Advanced Learner's Dictionary entry: catalyst