Definition of reactivity noun from the Oxford Advanced Learner's Dictionary

 

reactivity

 noun
noun
BrE BrE//ˌriːækˈtɪvɪti//
 
; NAmE NAmE//ˌriːækˈtɪvɪti//
 
(chemistry)
 
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the degree to which something reacts, or is likely to react Oxygen has high reactivity.
See the Oxford Advanced American Dictionary entry: reactivity