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Effectiveness

//ɪˈfɛk.tɪv.nɪs// noun

Noun

1
The property of being effective, of achieving results. countable, uncountable
"The effectiveness of the drug was well established."
2
capacity to produce strong physiological or chemical effects wordnet
3
The capacity or potential for achieving results. countable, uncountable
"The problem with these precedents is that the Security Council did not authorize intervention in Syria, and an intervention there will thus harm, not help, the Council’s credibility and effectiveness."
4
power to be effective; the quality of being able to bring about an effect wordnet
5
The degree to which something achieves results. countable, uncountable
"He questioned the effectiveness of the treatment."

From effective + -ness.

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