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  1. Oxford American Dictionary

    efficacious

    • IPA[ˌefəˈkāSHəs]

    美式

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

    形容詞

    • 1. formal (of something inanimate or abstract) successful in producing a desired or intended result; effective the vaccine has proved both efficacious and safe