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Efficacy vs. Efficiency vs. Proficiency
See complete definition in Reverso Define, with examples
efficacy
Definition
capacity or power to produce a desired effect
Examples
concern about the safety and efficacy of the vaccine
See complete definition in Reverso Define, with examples
efficiency
Definition
the ratio of the output to the input of any system
Examples
she did the work with great efficiency
See complete definition in Reverso Define, with examples
proficiency
Definition
the quality of having great facility and competence
Examples
practice greatly improves proficiency
Other misspelled words
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