Definition of effectual adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈfektʃuəl//
; NAmE NAmE//ɪˈfektʃuəl//
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(of things, not people) producing the result that was intended synonym effective an effectual remedy compare ineffectual Word Originlate Middle English: from medieval Latin effectualis, from Latin effectus, from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’.
See the Oxford Advanced American Dictionary entry: effectual