1. Dictionary

    ef·fi·ca·cious
    [ˌefəˈkāSHəs]
    adjective
    formal
    efficacious (adjective)
    1. (of something inanimate or abstract) successful in producing a desired or intended result; effective:
      "the vaccine has proved both efficacious and safe"
    Origin
    early 16th century: from Latin efficax, efficac- (from efficere ‘accomplish’: see effect)+ -ious.
    Translate efficacious to
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    Similar and Opposite Words
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  3. Efficacy Definition & Meaning - Merriam-Webster

  4. Efficacy - Definition, Meaning & Synonyms | Vocabulary.com

  5. EFFICACIOUS | definition in the Cambridge English Dictionary

  6. Efficacious Definition & Meaning | Britannica Dictionary

  7. efficaciousness noun - Oxford English Dictionary

  8. EFFICACY definition and meaning | Collins English Dictionary

  9. EFFICACIOUSLY | English meaning - Cambridge Dictionary

  10. EFFICACIOUS Synonyms: 75 Similar and Opposite Words

  11. 18 Synonyms & Antonyms for EFFICACIOUSNESS

  12. efficacious, adj. meanings, etymology and more - Oxford English …

  13. EFFECTIVENESS | English meaning - Cambridge Dictionary

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