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ef·fec·tu·al / iˈfekchoōəl/ • adj. (typically of something inanimate or abstract) successful in producing a desired or intended result; effective: tobacco smoke is the most effectual protection against the mosquito. DERIVATIVES: ef·fec·tu·al·i·ty / iˌfekchoōˈalitē/ n. ef·fec·tu·al·ly adv. ef·fec·tu·al·ness n.