Efficacious meaning

ĕfĭ-kāshəs
Producing or capable of producing the desired effect; having the intended result; effective.

An efficacious drug.

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Producing or capable of producing a desired effect.
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The definition of efficacious is someone or something that successfully produced a result that was desired.

An example of efficacious is a program that was designed to help stop crime and that reduced the crime rate by 80 percent.

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Origin of efficacious

  • From Latin efficāx efficāc- from efficere to effect effect

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French efficacieux, from Latin efficax (“efficacious”), from efficere (“to effect, accomplish, to”); see effect.

    From Wiktionary