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Definitions

catalyst

[kat-l-ist] / ˈkæt l ɪst /
NOUN
something which incites activity
Synonyms
STRONGEST
impetus incentive motivation stimulant
STRONG
adjuvant agitator enzyme goad impulse incendiary incitation incitement reactant reactionary spur synergist
WEAK
radical stimulus spark plug wave maker
Antonyms
STRONGEST
block hindrance
WEAK
blockage preventer prevention

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

AI advances provided the catalyst that ignited Palantir’s stock.

From MarketWatch • Apr. 4, 2026

Marl-Brock had been telling others and that was "the catalyst" for what happened later.

From BBC • Apr. 4, 2026

The jobs report for March could also be a macroeconomic catalyst that leads investors to trade Bitcoin due to a lack of anything else.

From Barron's • Apr. 3, 2026

Shareholders have been hoping for some kind of catalyst.

From Barron's • Apr. 2, 2026

At home Brian was virtually silent, and Tony wasn’t sure what had been the catalyst for his keen intellect, or how and from where he had acquired it.

From "Friday Night Lights: A Town, A Team, And A Dream" by H.G. Bissinger