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What is a catalyst?

What is a catalyst? Here are some definitions.

Noun
  1. (chemistry) A substance that increases the rate of a chemical reaction without being consumed in the process.
  2. Someone or something that encourages progress or change.
  3. (literature) An inciting incident that sets the successive conflict into motion.
  4. (automotive) A catalytic converter.
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Examples
This conflict is a catalyst, leading to the re-examination of the relationships between these six people.
The methanol reacts with water in the presence of a catalyst to produce hydrogen ions and electrons.
The present invention relates to a new fluidized-bed catalyst used in a process of propylene ammoxidation to acrylonitrile.
His almost unnoticed donkey work was the catalyst for a superb performance.
A catalyst for this reevaluation was horrifying devastation caused by use of the atomic bomb in Japan.
The case may turn out to be one of those terrible incidents that provide a wake-up call and a catalyst for positive change.

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