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effectiveness

noun
 OPAL W
🔊/ɪˈfektɪvnəs/
🔊/ɪˈfektɪvnəs/
(also less frequent effectivity
🔊/ɪˌfekˈtɪvəti/
🔊/ɪˌfekˈtɪvəti/
)
[uncountable]
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  1. 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检查安全系统的有效性
    see also cost-effectiveness opposite ineffectivenessTopics Successc1, Change, cause and effectc1