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This page will make sure you never confuse efficacy and efficiency and proficiency again! Read the definitions, check out our example sentences, and be sure to follow the twitter feed to see how the internet is using these words in a sentence.
Got efficacy and efficiency and proficiency figured out? Check out the complete index of commonly confused English words.

Definition

1
Efficacy

Capacity or power to produce a desired effect

Examples

Concern about the safety and efficacy of the vaccine

2
Efficiency

The ratio of the output to the input of any system

Examples

She did the work with great efficiency

3
Proficiency

The quality of having great facility and competence

Examples

Practice greatly improves proficiency

Live Twitter Feeds

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