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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Efficience  \Ef*fi"cience\,  Efficiency  \Ef*fi"cien*cy\,  n.  [L. 
  1.  The  quality  of  being  efficient  or  producing  an  effect  or 
  effects;  efficient  power;  effectual  agency. 
  The  manner  of  this  divine  efficiency  being  far  above 
  us  --Hooker. 
  2.  (Mech.)  The  ratio  of  useful  work  to  energy  expended. 
  {Efficiency  of  a  heat  engine},  the  ratio  of  the  work  done  an 
  engine,  to  the  work  due  to  the  heat  supplied  to  it