Laxi Dictionary

American Dictionary

Define dictionary terms easily in our powerful online English dictionary.

Searching for...

No matching words found

Try a different search term or browse the dictionary

Definition efficacy in American English

efficacy noun

[uncountable] noun
/ˈefɪkəsi/
Example

The efficacy of the medical procedure has not been proven.

Synonyms and related words
usefulness efficiency effectiveness
Definition efficacy in American English