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

 

effectiveness

 noun
noun
BrE BrE//ɪˈfektɪvnəs//
 
; NAmE NAmE//ɪˈfektɪvnəs//
 
(less frequent effectivity
BrE BrE//ɪˌfekˈtɪvɪti//
 
; NAmE NAmE//ɪˌfekˈtɪvɪti//
 
)
[uncountable]
 
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the fact of producing the result that is wanted or intended; the fact of producing a successful result to check the effectiveness of the security system opposite ineffectiveness

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