catalyst
Say it: KAT-uh-list /ˈkat(ə)lɪst/ · noun
What “catalyst” means
Something that sets change in motion.
More precisely: A substance that speeds up a chemical reaction without being used up; or anything that triggers change.
When to use it
In everyday or formal talk, for something that sparks a change, especially one that was already possible.
It can also mean
In chemistry, a substance that speeds a reaction without being used up.
Similar words
trigger, spark, stimulus
Where it comes from
From Greek katalusis, 'dissolution', from kataluein 'to dissolve'.
Quick check
One neighbour plants flowers, inspiring the whole street to start gardening. What was that first planting?
a consequence or a catalyst?
Show the answer
a catalyst
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