Webster's English Dictionary

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amplify

Cross references:
  1. expand                
 
am.pli.fy \-.fi-\ vb [ME amplifien, fr. MF amplifier, fr. L amplificare, 
   fr. am]plus 1: to expand (as a statement) by clarifying detail or 
   illustration or by closer analysis 2: INCREASE, EXTEND  3: to utilize (an 
   input of power) so as to obtain an output of greater magnitude through the 
   relay action of a transducer : to expand one's remarks or ideas