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 efficient \ef*fi"cient\ ([e^]f*f[i^]sh"ent), a. [L. efficiens,
   -entis, p. pr. of efficere to effect: cf. F. efficient. See
   {Effect}, n.]
   Causing effects; producing results; that makes the effect to
   be what it is; actively operative; not inactive, slack, or
   incapable; characterized by energetic and useful activity;
   as, an efficient officer, power.
   [1913 Webster]

         The efficient cause is the working cause. --Wilson.

   Syn: Effective; effectual; competent; able; capable;
        material; potent.
        [1913 Webster]