effectiveness
Americannoun
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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.
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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.
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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.
Other Word Forms
Etymology
Origin of effectiveness
First recorded in 1600–10; effective ( def. ) + -ness ( def. )
Vocabulary lists containing effectiveness
Reading: Informational - Middle School
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Media Literacy - High School
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Media Literacy - Middle School
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The society also emphasized the importance of specialist training, careful patient selection, and continued clinical trials to establish the treatment's effectiveness and long-term safety.
From Science Daily ● Oct. 14, 2026
His effectiveness here has been noticed too by England boss Thomas Tuchel who, during this international break, has emulated Arteta's use of Lewis-Skelly.
From BBC ● Oct. 9, 2026
He has said on social media that the sanctions against him indicate “the effectiveness of our economic activities.”
From The Wall Street Journal ● Oct. 9, 2026
Despite their effectiveness, these treatments remain difficult for many patients to obtain.
From Science Daily ● Oct. 7, 2026
It is the cost of that kind of technology, and its relative effectiveness, that must be compared with the cost and effectiveness of the vaccine.
From "The Lives of a Cell" by Lewis Thomas
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
