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.
She’s also planning to be hands-on manager, using data to assess the city’s effectiveness.
From Los Angeles Times ● Nov. 5, 2026
Saudi Arabia has responded with airstrikes, but there is a limit to their effectiveness.
From The Wall Street Journal ● Nov. 5, 2026
Clinical trials will need to evaluate its safety, effectiveness, appropriate dosage, and potential side effects before it could become a practical obesity treatment.
From Science Daily ● Nov. 4, 2026
In January, a House of Lords select committee started a review of the Domestic Abuse Act 2021 to consider its impact and effectiveness.
From BBC ● Nov. 3, 2026
The effectiveness of the suffragist and temperance movements would endow American women with more power than they had ever known.
From "1919 The Year That Changed America" by Martin W. Sandler
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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.
