Word Study
    
                                	effervescive |
                                	effet |
                                	effete |
                                	efficacious |
                                	efficaciously |
                                efficaciousness
                                	| efficacity 
                                	| efficacy 
                                	| efficience 
                                	| efficiency 
                                	| efficiency apartment 
                            
        efficaciousness
WORDNET DICTIONARY
Noun efficaciousness has 1 sense
- efficaciousness(n = noun.attribute) efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine" is a kind of effectiveness, effectivity, effectuality, effectualness
Derived forms adjective efficacious2, adjective efficacious1
CIDE DICTIONARY
efficaciousness, n. 
                                            
                                         the capacity or power to produce a desired effect.                                                                                 [WordNet 1.5]                                                                                                                    
                                                                                    
            For further exploring for "efficaciousness" in Webster Dictionary Online
        


 
    
 
