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Chemistry. the causing or accelerating of a chemical change by the addition of a catalyst.
an action between two or more persons or forces, initiated by an agent that itself remains unaffected by the action:
social catalyses occasioned by controversial writings.
noun (pl) -ses (-ˌsiːz)
acceleration of a chemical reaction by the action of a catalyst

1650s, “dissolution,” from Latinized form of Greek katalysis “dissolution, a dissolving” (of governments, military units, etc.), from katalyein “to dissolve,” from kata- “down” (or “completely”), see cata-, + lyein “to loosen” (see lose). Chemical sense “change caused by an agent which itself remains unchanged” is attested from 1836, introduced by Swedish chemist Jöns Jakob Berzelius (1779-1848).

catalysis ca·tal·y·sis (kə-tāl’ĭ-sĭs)
n. pl. ca·tal·y·ses (-sēz’)
The action of a catalyst, especially an increase in the rate of a chemical reaction.


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    to act upon by catalysis. Contemporary Examples On the band-wagon of growing criticism over Israeli policies, these groups use BDS to catalyze an anti-Israeli zeitgeist. Partial B(DS)? Eran Shayshon July 17, 2012 They reward leaders who push the envelope, catalyze action, and get stuff done. How Cities Are Fixing America Bruce Katz, Jennifer Bradley June […]

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    a city in N Argentina. Historical Examples This people had lived from time immemorial in the valleys of Rioja and Catamarca, and had been under the suzerainty of the Incas. Argentina W. A. Hirst Catamarca is connected by railways with Rioja and Patquia and with Cordoba. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5 Various […]

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