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# efficacy

noun (efficacy — uncountable, formal)

«efficacy» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

(formal) The power to produce the result you want, especially of a medicine, treatment or method. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#m1)

### In the lessons

A formal word used in science and medicine, and in exam texts. Scientists measure the efficacy of medicines in careful trials. Phrases: «the efficacy of», «proven efficacy», «test the efficacy».

### Examples

- Doctors tested the efficacy of the new vaccine. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x1)
- We doubted the efficacy of his homemade cure. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x2)
- The efficacy of the method was shown by better test results. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x3)
- Studies prove the efficacy of hand washing against germs. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x4)
- Scientists compared the efficacy of two sun creams. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x5)
- The efficacy of prayer is a matter of faith for many. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x6)
- This he readily accepted, trusting to the efficacy of the antidote. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/#x7)

### Note

Uncountable, formal. Adjective: «efficacious». Do not confuse with «efficiency» (doing something without waste of time or energy). Stress: EF-ih-kuh-see.

## On Mova

- [Trees and pragmatics of «efficacy» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«efficacy» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/efficacy.html) on Mova free.