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# efficacy

«efficacy» in Mova's school dictionary: **The power to produce the result you want, especially of a…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (efficacy — uncountable, formal)

### meaning for a pupil

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

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

### Trees and pragmatics

[Every meaning and example of «efficacy» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/E/efficacy/), each sentence with its dependency tree and frames.