effectiveness B2 Topic:Describing Qualities US /ɪˈfɛk.tɪv.nɪs/ See IPA manual Freq #27697 Meanings 1 noun The quality of working well and producing good results. The effectiveness of the drug was well established. 2 noun How well something achieves its intended results. He questioned the effectiveness of the treatment. Thesaurus Synonyms 1 noun · the quality of working well... effectuality Word family Forms effectivenesses Derived forms bioeffectivenesscost-effectiveness Related forms effecteffectiveeffectivityeffectoreffectualeffectuateefficaciousefficacityefficacyefficiencyefficient Etymology AI details From effective + -ness. Topics Describing Qualities External links Cambridge Dictionary Wiktionary Google Images # effectiveness **Type:** Word **Level:** B2 **Part of speech:** noun **IPA (US):** /ɪˈfɛk.tɪv.nɪs/ **Frequency rank:** 27697 ## Meanings 1. The quality of working well and producing good results. 2. How well something achieves its intended results. ## Examples - The effectiveness of the drug was well established. - He questioned the effectiveness of the treatment. ## Derived Forms - bioeffectiveness - cost-effectiveness ## Related Forms - effect - effective - effectivity - effector - effectual - effectuate - efficacious - efficacity - efficacy - efficiency - efficient ## Etymology From effective + -ness. ## AI Etymology Effectiveness is formed from effective + -ness. In current use, the main senses are “The quality of working well and producing good results” and “How well something achieves its intended results”. ## Topics - Describing Qualities markdown