capacity or power to produce a desired effect
"concern about the safety and efficacy of the vaccine"
The numerical value of efficaciousness in Chaldean Numerology is: 8
The numerical value of efficaciousness in Pythagorean Numerology is: 1
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"efficaciousness." Definitions.net. STANDS4 LLC, 2017. Web. 14 Dec. 2017. <http://www.definitions.net/definition/efficaciousness>.