Webster's English Dictionary

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efficient

Cross references:
  1. effective             
 
ef.fi.cient \i-'fish-*nt\ aj [ME, fr. MF or L; MF, fr. L efficient-, 
   efficiens, fr. pp. of ef]ficere to bring about 1: immediately effecting  2: 
   productive of desired effects; esp : productive without waste  - 
   ef.fi.cient.ly av