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catalyst

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noun [countable] catalyst pronunciation in American English /ˈkæt(ə)lɪst/
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singularcatalyst
pluralcatalysts
  1. 1
    someone or something that causes something to happen or change
    catalyst for:

    The new development will act as a catalyst for growth in business and tourism.

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… a teaching method in which groups of children learn independently using a computer linked to the internet

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