May 30, 2011 ยท Effective typically describes thingsโ€”such as policies, treatments, arguments, and techniquesโ€”that do what they are intended to do. People can also be described as effective when โ€ฆ EFFECTIVE meaning: 1. successful or achieving the results that you want: 2. (used about a treatment or drug) workingโ€ฆ. The adjective effective has many shades of meaning, but you'll usually see it describing something that's able to produce a desired goal. Effective traces back to the Latin word effectivus, from efficere, โ€ฆ Apr 26, 2026 ยท Adjective effective (comparative more effective, superlative most effective) Having the power to produce a required effect or effects. Definition of effective adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. syn: effective, effectual, efficacious, efficient refer to that which produces or is able to produce an effect. effective is applied to something that produces a desired or expected effect, often a lasting one: an โ€ฆ Effective, effectual, efficacious, efficient refer to that which is able to produce a (desired) effect. Effectiveness is the capability of producing a desired result or the ability to produce desired output. When something is deemed effective, it means it has an intended or expected outcome, or produces โ€ฆ.

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