Meaning of the word efficacy in English

What does efficacy mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

efficacy

US /ˈef.ə.kə.si/
UK /ˈef.ɪ.kə.si/

Noun

the ability to produce a desired or intended result

Example:
The drug's efficacy in treating the disease was proven in clinical trials.
We need to assess the efficacy of the new teaching methods.
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