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Definition of: catalysis
(kə·tal′ə·sis) noun plural ·ses (-sēz) Chem.
An alteration in the speed of a chemical reaction effected by the presence of an agent or substance that itself remains stable. [<Gk. katalysis dissolution <kata- wholly, completely + lyein loosen]
—cat·a·lyt·ic (kat′ə· lit′ik) adjective & noun
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