GREdic.com

catalyst

noun

• a substance that accelerates the rate of a chemical reaction without itself changing; a person or thing that causes change [Princeton Review]
• substance that speeds up a chemical reaction without itself changing [Barron]
• 1. something that causes activity between two or more persons or forces without itself being affected
  2. 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
  3. a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic
  [Webster]

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