effectiveness

American

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

Rarely effectivity

noun

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.
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.
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

subeffectiveness noun
supereffectiveness noun
uneffectiveness noun

Etymology

Origin of effectiveness

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

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.

“Adolescence” powerfully channels the intimacy of a live theater experience into each of its frames, an effectiveness that leaves the viewer physically shaken by the end of its third episode.

From Salon

Researchers expect the findings to support future applications ranging from the development of health functional foods to improving vaccine effectiveness and reducing the risk of immune-related diseases.

From Science Daily

The decision to hold was made to maintain the rupiah’s stability, strengthen the effectiveness of transmission of monetary policy and stimulate economy growth, Gov. Perry Warjiyo said at a press conference.

From The Wall Street Journal

Concerns exist regarding the program’s effectiveness due to short deployment times and potential conflicts, as participating private sector companies are also federal contractors.

From Barron's

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023