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WordNet-Online
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Noun contact action has 1 sense
- catalysis, contact action - acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
--1 is a kind of chemical process, chemical change, chemical action
--1 has particulars: autocatalysis
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