Noah Webster
Efficience
EFFI'CIENCE
EFFI'CIENCY, noun [Latin efficiens, from efficio. See Effect.]
1. The act of producing effects; a causing to be or exist; effectual agency.
The manner of this divine efficiency is far above us.
Gravity does not proceed from the efficiency of any contingent or unstable agent.
2. Power of producing the effect intended; active competent power.