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efficaciousness:


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Concise Oxford English Dictionary © 2008 Oxford University Press:
efficacious /ˌɛfɪˈkeɪʃəs/
adjective formal effective.
– derivatives
efficaciously adverb,
efficaciousness noun,
efficacy /ˈɛfɪkəsi/ noun.
– origin C16: from L. efficax, efficac- (from efficere ‘accomplish’) + -ious.



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