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English definition of “effective”

effective

adjective (SUCCESSFUL)    /ɪˈfek.tɪv/
B2 successful or achieving the results that you want : It's an extremely effective cure for a headache . The lighting for the production made a very effective use of shadow . She's a very effective teacher . → Opposite ineffectiveEfficient and effective ineffectiveGrammar:Efficient or effective?Efficient and effective are adjectives. effectiveness     /-nəs/ noun [U] C1 There are doubts about the effectiveness of the new drug (= how successful it is) in treating the disease .Efficient and effective
(Definition of effective adjective (SUCCESSFUL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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