effectiveness

[ ih-fek-tiv-nis, ee-fek‐ ]

noun

the quality of producing an intended or desired result: For maximum effectiveness of your weight loss plan, you need to combine exercise with a healthy diet.
the quality of producing a deep or vivid impression: We were struck by the evident appeal and effectiveness of these short, dramatic, upbeat video stories.

a measure of the success of a vaccine or other pharmaceutical when used in the real world, as opposed to the controlled environment of a clinical trial.: Compare efficacy (def. 2).

Origin of effectiveness

First recorded in 1600–10; effective + -ness

Unfortunately, it isn’t effective, and it has not made a difference.
Senate holds hearing on hydroxychloroquine, despite no evidence it works against covid-19 | Marisa Iati | November 20, 2020 | Washington Post
They’re shocked because it’s the first time where there could be some actual effective enforceability.
Apple is lobbying against a bill aimed at stopping forced labor in China | Reed Albergotti | November 20, 2020 | Washington Post
Meanwhile, South Korea was drawing worldwide attention for its effective handling of the virus through large-scale testing.
Hogan’s first batch of coronavirus tests from South Korea were flawed, never used | Steve Thompson | November 20, 2020 | Washington Post
It was 94 percent effective in people older than 65, a group of critical concern because older people are more likely to develop life-threatening illness after contracting the virus.
Pfizer and BioNTech will seek regulatory clearance of their coronavirus vaccine | Carolyn Y. Johnson | November 20, 2020 | Washington Post
The Treasury and the Fed jointly established a suite of emergency programs in the early days of the pandemic — and they have at times clashed over how the programs should be structured and how effective they can be.
Treasury Secretary Mnuchin cuts off several Federal Reserve emergency aid programs, sparking unusual rebuke from Fed | Rachel Siegel, Jeff Stein | November 20, 2020 | Washington Post

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