capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.

Is Efficaciousness a word?

The power or capacity to produce a desired result: effect, effectiveness, effectuality, effectualness, efficacy, efficiency, influence, potency.

What does Efficaciousness meaning?

: having the power to produce a desired effect an efficacious remedy. Other Words from efficacious Synonyms & Antonyms Choose the Right Synonym More Example Sentences Learn More About efficacious.