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efficacious - vocabulary

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efficacious - adjective

Capable of having the desired result; effective as a method, means, or remedy.

Note: The noun form efficacy means effectiveness. For example, to gain FDA approval, a drug company must show the efficacy of the drug.

The efficacy of religion lies precisely in what is not rational, philosophic or eternal; its efficacy lies in the unforeseen, the miraculous, the extraordinary.

—Henri Frédéric Amiel Journal (1885)

Note: You may download the Grammar eBook Build Your Vocabulary and get all 406 vocabulary words.

 

Next Word: effrontery Previous Word: effete

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