noun Biochemistry.
the increase or decrease in the rate of interaction between a reactant and a protein as the reactant concentration increases.
Also, co-operativity.

cooperative + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cooperativity (kəʊˌɒpərəˈtɪvɪtɪ)
biochem, chem an interaction between structural units within a molecule or between molecules in an assemblage that enables the system to respond more sharply to an external change than would isolated units

Collins English Dictionary - Complete & Unabridged 10th Edition
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