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1. Oxford Dictionary

   effectual

   • IPA[ɪˈfɛktʃʊəl]

   英式

   • adj.
     (of something inanimate or abstract) successful in producing a desired or intended result; effective；(of a legal document) valid or binding.
2. • 釋義

   adj.

   形容詞

   • 1. (of something inanimate or abstract) successful in producing a desired or intended result; effective tobacco smoke is the most effectual protection against the midge 同義詞 effective, successful, efficacious, productive, constructive, ... 更多fruitful, potent, powerful, worthwhile, helpful, of help, of assistance, beneficial, advantageous, valuable, useful, of use反義詞 ineffectual
   • ▪ (of a legal document) valid or binding. 同義詞 valid, authentic, legally acceptable, proper, bona fide, ... 更多genuine, official, signed and sealed, lawful, legal, licit, legitimate, (legally) binding, contractual, in force, in effect, effective
3. • 更多解釋

   effectual

   • IPA[əˈfek(t)SH(əw)əl]

   美式

   • adj.
     (of something inanimate or abstract) successful in producing a desired or intended result; ... tobacco smoke is the most effectual protection against the mosquito

   Oxford American Dictionary