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catalyst

/'k/&/t/-/l/I/st/

Definitions, examples, synonyms and antonyms from WordNet 3.0.

noun

  1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

    noun.substance

    Source: WordNet 3.0

  2. something that causes an important event to happen

    noun.person

    Examples
    The invasion acted as a catalyst to unite the country.

    Source: WordNet 3.0

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