Catalysis Definition
 kə-tălĭ-sĭs 
  catalyses
  
    noun
  
 
    catalyses
  
The speeding up or, sometimes, slowing down of the rate of a chemical reaction caused by the addition of some substance that does not undergo a permanent chemical change.
 Webster's New World 
Synonyms: 
  - contact action
 - thermolysis
 - photolysis
 
Origin of Catalysis
-  
Greek katalusis dissolution from katalūein to dissolve kata- intensive pref. cata– lūein to loosen leu- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 From Ancient Greek κατάλυσις (katalusis, “dissolution”), from καταλύω (kataluō, “I dissolve”), from κατά (kata, “down”) + λύω (luō, “I loose”).
From Wiktionary
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