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



(less frequent effectivity noun
BrE BrE//ɪˌfekˈtɪvɪti//
; NAmE NAmE//ɪˌfekˈtɪvɪti//
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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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