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.
Those studies will be essential for determining its safety, appropriate use, and potential effectiveness in patients.
From Science Daily ● Oct. 17, 2026
Now there are wearable technologies—such as headbands designed to aid meditation or sleep—whose effectiveness remains debatable.
From The Wall Street Journal ● Oct. 16, 2026
If further research confirms its safety and effectiveness, the technology could reduce the need for more invasive procedures while making advanced nerve stimulation treatments easier to deliver.
From Science Daily ● Oct. 11, 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
“Some say that by participating in the charrette, I’ve lost my effectiveness in the conservative community,” he said with a small, sad smile.
From "The Best of Enemies" by Osha Gray Davidson
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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.
