efficacy vs. efficiency vs. proficiency – The Correct Way to Use Each – English Learning

Spelling Book

Confusing Words

VS.

Efficacy

Definition:

capacity or power to produce a desired effect

Examples:

concern about the safety and efficacy of the vaccine

VS.

Efficiency

Definition:

the ratio of the output to the input of any system

Examples:

she did the work with great efficiency

VS.

Proficiency

Definition:

the quality of having great facility and competence

Examples:

practice greatly improves proficiency

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