Successful in producing the intended result; adequate to accomplish a purpose; capable and effective.
From Latin 'effectualis,' derived from 'effectus' (effect). The suffix '-ual' emphasizes the quality of being actual or real in producing results.
'Effectual' is the more formal, philosophical cousin of 'effective.' Philosophers prefer 'effectual' when discussing real causation—it carries weight suggesting something truly accomplishes its purpose, not just appears to.
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