adjective
EXAMPLES FROM CORPUS
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Have denotes an exercise of authority which is effectual , that is, which ensures the realization of the action commanded.
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I have yet to learn an effectual protective against the midge.
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In all, Barratt considered that an effectual trial on the Bonsor Lode could be made for about £1,000.
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Of course, such prior advertisement of a new law is usually necessary for it to be an effectual deterrent.
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The plant was boiled in water and the resulting infusion was said to be an effectual diuretic.