catalyst

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Pronunciation[change]

Noun[change]

Singular
catalyst

Plural
catalysts

  1. (chemistry) A substance that makes a chemical reaction happen faster. The catalyst is not changed by the process and can be used again.
  2. (automotive) A catalytic converter.
  3. Someone or something that encourages progress or change, or helps it happen.
    I hope the new CEO will be a catalyst for change.
    Communication is a catalyst for peace.

Antonyms[change]