catalystn. 1. (Chem.) a substance that initiates or accelerates a chemical reaction without itself being affected; as, thousands of enzymes serve in concert as calaysts to produce the sequence of reactions we call "life"; the industrial production of cheap ammonia depended on finding a good catalyst.
2. something that serves as a precipitating occasion for an event; as, the invasion acted as a
catalyst to unite the country. A
catalyst is never the main cause of an event, but may serve to hasten events for which the underlying causes are present prior to the appearance or occurrence of the
[WordNet 1.5 +PJC]
3. something or someone that causes events to happen with itself being changed.
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Sat 18th January 2020