/ ɪˈfektʃuəl; NAmE / adjective
( formal ) (of things, not people) producing the result that was intended
SYN effective :
an effectual remedy
—compare ineffectual
► ef·fec·tual·ly adjective
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WORD ORIGIN
late Middle English : from medieval Latin effectualis , from Latin effectus , from efficere accomplish, from ex- out, thoroughly + facere do, make.