cat·a·lyst /ˈkætlɪst/ [kat-l-ist]
–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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