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  1. Dictionary
    efficacious
    /ˌɛfɪˈkeɪʃəs/

    adjective

    • 1. (of something inanimate or abstract) successful in producing a desired or intended result; effective: formal "this treatment was efficacious in some cases"

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  2. www.merriam-webster.com › dictionary › efficaciousEfficacious Definition & Meaning - Merriam-Webster

    The meaning of EFFICACIOUS is having the power to produce a desired effect. How to use efficacious in a sentence. Did you know? Synonym Discussion of Efficacious.

  3. dictionary.cambridge.org › dictionary › englishEFFICACIOUS | English meaning - Cambridge Dictionary

    (used about a treatment or drug) working well under carefully controlled scientific testing conditions: Two versions of the vaccine have been shown in trials to be between 90% and 95% efficacious. Compare. effective (SUCCESSFUL) specialized. Related words. efficaciously. efficacy. efficacity. SMART Vocabulary: related words and phrases.

  4. dictionary.cambridge.org › us › dictionaryEFFICACIOUS | definition in the Cambridge English Dictionary

    adjective. us / ˌef.əˈkeɪ.ʃəs / uk / ˌef.ɪˈkeɪ.ʃəs / Add to word list. formal. able to produce the intended result: We believe that educational or counseling programs are a more efficacious way of dealing with this problem than harsh sanctions. Synonym. effective (SUCCESSFUL) Thesaurus: synonyms, antonyms, and examples.

  5. www.collinsdictionary.com › dictionary › englishEFFICACIOUS definition and meaning | Collins English Dictionary

    producing or capable of producing the desired effect; having the intended result; effective. an efficacious drug. SIMILAR WORDS: efˈfective. Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved. Derived forms. efficaciously (ˌeffiˈcaciously) adverb.

  6. www.vocabulary.com › dictionary › efficaciousEfficacious - Definition, Meaning & Synonyms - Vocabulary.com

    When you really want to do something right, really nail it, really get at what you were going for — you're trying to be efficacious, or produce the effect you intended. The word efficacious is made up of the Latin efficere meaning "accomplish" and the suffix -ious meaning "full of."

  7. www.thefreedictionary.com › efficaciousEfficacious - definition of efficacious by The Free Dictionary

    efficacious - marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"

  8. www.oxfordlearnersdictionaries.com › english › efficaciousefficacious adjective - Definition, pictures, pronunciation and...

    Definition of efficacious adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.