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A catalyst starts a reaction. cat·a·lyst Audio Help /ˈkætlɪst/ Pronunciation Key - Show Spelled Pronunciation[kat-l-ist] Pronunciation Key - Show IPA Pronunciation -noun 1. Chemistry. a substance that causes or accelerates a chemical reaction without itself being affected. 2. something that causes activity between two or more persons or forces without itself being affected. 3. a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution. 4. a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic.

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