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 study was not designed to compare the effectiveness of the treatments or determine whether paricalcitol extends survival.
From Science Daily ● Oct. 4, 2026
Despite this focus, research on the effectiveness of influencers is limited.
From Salon ● Oct. 2, 2026
In 2007, financial professionals Holden Karnofsky and Elie Hassenfeld quit their jobs to launch GiveWell, which produced data-driven analyses of charities' effectiveness.
From Barron's ● Oct. 2, 2026
The elected superintendent is reimagined as a student “champion” who would analyze and report on the effectiveness of the education system and also take on an advocacy role.
From Los Angeles Times ● Oct. 1, 2026
There never has been a man who asserted anything with more effectiveness, nor whose affirmations rested upon greater oaths, who observed them less.
From "The Prince" by Niccolò Machiavelli
Definitions 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.
