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Answer for the clue "Capacity or power to produce a desired effect ", 15 letters:
efficaciousness

Word definitions for efficaciousness in dictionaries

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

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
efficaciousness \ef`fi*ca"cious*ness\ n. the capacity or power to produce a desired effect. Syn: efficacy.

Wiktionary Word definitions in Wiktionary
n. Quality of being efficacious.