effectiveness
/ɪˈfɛk.tɪv.nɪs/
Proposed by a contributor, not yet supported by evidence.
Also seen as: effectivenesses
Sense 1
Meaning · English
The property of being effective, of achieving results.
Noun
Examples
The effectiveness of the drug was well established.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
The capacity or potential for achieving results.
Noun
Examples
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.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “effectiveness” mean?
The property of being effective, of achieving results.
Is “effectiveness” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.