effectiveness

American  

[ih-fek-tiv-nis, ee-fek‐] / ɪˈfɛk tɪv nɪs, iˈfɛk‐ /

Rarely effectivity

noun

1. 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.

2. 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.

3. 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.

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Other Word Forms

• subeffectiveness noun
• supereffectiveness noun
• uneffectiveness noun

Etymology

Origin of effectiveness

First recorded in 1600–10; effective ( def. ) + -ness ( def. )

Example Sentences

There’s no real research to prove its effectiveness.

From The Wall Street Journal

Cultural constraints have limited the long-term effectiveness of China's pronatalist measures, said Pan Wang, an associate professor at Australia's University of New South Wales.

From Barron's

"When used as part of a comprehensive risk assessment, these results could have a real impact on improving the safety and effectiveness of screening and prevention."

From Science Daily

As competition intensifies, brands face growing pressure to be more transparent, and to focus on ingredients and the effectiveness of their products rather than celebrity endorsements.

From BBC

Professor Edwin Galea, from the University of Greenwich, said the effectiveness of retardant treatment on PU foam can wear off over time.

From BBC

Related Words

• capability
• efficacy
• efficiency
• potency
• power
• success