ca·​tal·​y·​sis | \ kə-ˈta-lə-səs How to pronounce catalysis (audio) \
plural catalyses\ kə-​ˈta-​lə-​ˌsēz How to pronounce catalyses (audio) \

Definition of catalysis

: a modification and especially increase in the rate of a chemical reaction induced by material unchanged chemically at the end of the reaction

Examples of catalysis in a Sentence

Recent Examples on the Web

That crystalline structure imparts mechanical properties that are useful for catalysis, gas storage, and drug delivery, for example. Jennifer Ouellette, Ars Technica, "Watch this paper doll do sit-ups thanks to new kind of “artificial muscle”," 21 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'catalysis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of catalysis

1836, in the meaning defined above

History and Etymology for catalysis

Greek katalysis dissolution, from katalyein to dissolve, from kata- + lyein to dissolve, release — more at lose

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Statistics for catalysis

Last Updated

29 Jul 2019

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Time Traveler for catalysis

The first known use of catalysis was in 1836

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More Definitions for catalysis


ca·​tal·​y·​sis | \ kə-ˈtal-ə-səs How to pronounce catalysis (audio) \
plural catalyses\ -​ˌsēz How to pronounce catalyses (audio) \

Medical Definition of catalysis

: a change and especially increase in the rate of a chemical reaction induced by a catalyst

More from Merriam-Webster on catalysis

Rhyming Dictionary: Words that rhyme with catalysis Encyclopedia article about catalysis

Comments on catalysis

What made you want to look up catalysis? Please tell us where you read or heard it (including the quote, if possible).


a usually brief trip or an expedition

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