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ef·fi·ca·cious Listen to audio/ˌɛfəˈkeɪʃəs/ adjective
[more efficacious; most efficacious] formal : having the power to produce a desired result or effect : effective
▪ an efficacious remedy
— ef·fi·ca·cious·ly adverb
— ef·fi·ca·cious·ness noun [noncount]
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