Efficacy (Noun)
Syllable division: ef·​fi·​ca·​cy
How to pronounce: UK: /ˈef.ɪ.kə.si/ US: /ˈef.ə.kə.si/

British VS American Pronunciation of the word Efficacy

#1 Meaning: Something's capacity to deliver the desired consequence.
Example:
> She doubted the efficacy of the method.
> We have judged the efficacy of our regime on the basis of two studies performed among our outpatients.

#2 Meaning: How effectively a certain therapy or medicine performs under rigorous scientific testing circumstances.
Example:
> The drug's efficacy in curing TB was celebrated.
> Clinical trials are in progress to assess its efficacy in severe asthma.

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The efficacy of her work is amazing.

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