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Efficacy means useful, or able to perform a task satisfactorily. An example sentence would be: She examined the efficacy of the new grading tool at the end of the school year and decided that, because of all the bugs, it was practically useless.

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9y ago
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12y ago

The aim of the new study is to find the most efficacious treatments for the disease.

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Q: What is a sentence using the word efficacy?
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