effectiveness
UK: ɪˈfɛktɪvnəs | US: ɪˈfɛktɪvnəs
n. the degree to which something is successful in producing a desired result
n. the quality of being effective or efficient
The word "effectiveness" combines "effective," derived from Latin effectivus (from efficere, meaning "to accomplish"), with the suffix "-ness," which turns adjectives into nouns indicating a state or quality. The root "effect" traces back to Latin effectus (result, outcome), formed from ex- (out) + facere (to do/make). Over time, "effective" evolved to describe something capable of producing results, and "-ness" was added to abstract this quality.
The effectiveness of the new policy will be evaluated next year.
Her leadership effectiveness improved after the training program.
Scientists measured the drug's effectiveness in clinical trials.
The team discussed ways to increase marketing effectiveness.
Transparency is key to the effectiveness of any organization.