effectiveness

American  

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

Rarely effectivity

noun

1. 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.

2. 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.

3. 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.

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Other Word Forms

• subeffectiveness noun
• supereffectiveness noun
• uneffectiveness noun

Etymology

Origin of effectiveness

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

Example Sentences

Their effectiveness was discovered long before football was invented.

From Los Angeles Times

The minister also said Sweden was investing 1.3 billion kronor in its "space capability, with around 10 military satellites that will enhance the effectiveness of our unmanned systems and cruise missiles".

From Barron's

Future studies will focus on testing the biological effects of the newly discovered trace diterpenes and evaluating their safety and effectiveness in vivo.

From Science Daily

The findings highlight a key gap between controlled clinical trials and everyday use, where side effects, costs, and long-term adherence can limit the effectiveness of medication-based weight loss.

From Science Daily

There’s no real research to prove its effectiveness.

From The Wall Street Journal

Related Words

• capability
• efficacy
• efficiency
• potency
• power
• success