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The Collaborative International Dictionary
efficaciousness

efficaciousness \ef`fi*ca"cious*ness\ n. the capacity or power to produce a desired effect.

Syn: efficacy.

Wiktionary
efficaciousness

n. Quality of being efficacious.

WordNet
efficaciousness

n. capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine" [syn: efficacy] [ant: inefficacy]