Efficaciousness
The Century Dictionary and Cyclopedia
noun.
The quality of being efficacious; efficacy.
the GNU version of the Collaborative International Dictionary of English
noun.
the capacity or power to produce a desired effect.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
capacity or power to produce a desired effect
Word Usage
"The efficaciousness of the D&R approach is evident throughout "The Sorcerers and Their Apprentices.""
Hypernym
Words that are more generic or abstract
effectiveness
effectivity
effectuality
effectualness
Synonym
Words with the same meaning
efficacy