efficaciousness

from WordNet (r) 3.0 (2006)

efficaciousness
    n 1: capacity or power to produce a desired effect; "concern
         about the safety and efficacy of the vaccine" [syn:
         {efficacy}, {efficaciousness}] [ant: {inefficaciousness},
         {inefficacy}]

from The Collaborative International Dictionary of English v.0.48

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

   Syn: efficacy.
        [WordNet 1.5]

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