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Definition something that causes an important event to happen

on in Chemistry:  a substance that initiates or accelerates a chemical reaction without itself being affected
  • Catalysts to study your reactions, your brain waves, your thoughts.
    James Dashner  --  The Maze Runner
  • The spewing flame had its effect; heat and fire were catalysts.
    Robert Ludlum  --  The Bourne Ultimatum
  • Dave Severance became the catalyst for these reconnections.
    James Bradley  --  Flags of Our Fathers
  • The mention of Sophie's name had been the catalyst.
    Dan Brown  --  The Da Vinci Code
  • Cha Cha's encounter served as the catalyst for that year's Tradition.
    Luis J. Rodriguez  --  Always Running
  • My body was not to be used as an excuse; instead it was a catalyst.
    Jay Allison, et al.  --  This I Believe II
  • And you, Valentine's daughter, to be the catalyst for it all.
    Cassandra Clare  --  City of Fallen Angels
  • It was true; enzymes acted as catalysts for all chemical reactions, by providing a surface for two molecules to come together and react upon.
    Michael Crichton  --  The Andromeda Strain
  • The change spread .... faster and faster as the catalyzed reaction opened its surface of contact.
    Frank Herbert  --  Dune
  • We have removed the catalyst, true—but the world of men must still work to repair the damage that has been done, and then, ultimately, must choose peace.
    James A. Owen  --  Here, There be Dragons
  • We wanted to do so much, wanted to be small catalysts in the transformation of the disfigured sacramental body of the South, which had sired us.
    Pat Conroy  --  The Water is Wide
  • I may have been a catalyst for rebellion, but a leader should be someone with conviction, and I'm barely a convert myself.
    Suzanne Collins  --  Catching Fire
  • The sulfur and salt are alchemical catalysts that facilitate transformation.
    Dan Brown  --  The Lost Symbol
  • According to G., the police believed that Nieminen had been the catalyst behind the whole gang.
    Stieg Larsson  --  The Girl Who Played with Fire
  • It had catalyzed a revelation inside their home.
    Alice Sebold  --  Lucky
  • Meg McCaffrey, prophecies are the catalysts for every important event—every quest or battle, disaster or miracle, birth or death.
    Rick Riordan  --  The Hidden Oracle
  • It creates a healthy tension that serves as the catalyst that drives me to fulfill my limited potential.
    Jay Allison, et al.  --  This I Believe
  • Mark asked the question not because he thought Dutch could give him the answer, but as a catalyst to his own imagination.
    Pat Frank  --  Alas, Babylon
  • They were simply catalysts that brought existing problems into sharper focus.
    Nicholas Sparks  --  The Wedding
  • His terror was the catalyst.
    Alfred Bester  --  The Demolished Man

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