effectual
/ɪˈfektʃʊəl/adjective
1- (typically of something inanimate or abstract) successful in producing a desired or intended result; effective（尤指无生命或抽象事物）有效的, 奏效的：
tobacco smoke is the most effectual protection against the midge.
烟草的烟雾是最有效的防蚊剂。
1.1
- Law (of a legal document) valid or binding【律】（法律文件）有法律效力的, 有约束力的。
派生词
effectuality
nouneffectually
adverbeffectualness
noun词源
late Middle English: from medieval Latin effectualis, from Latin effectus （see EFFECT）.