Webster's English Dictionary

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multiplier

mul.ti.pli.er \'m*l-t*-.pli-(-*)r\ n : one that multiplies : as  : a number 
   by which another number is multiplied  : an instrument or device for 
   multiplying or intensifying some effect  : a key-operated machine or 
   mechanism or circuit on a machine that multip lies figures and records the 
   products : the ratio between the ultimate increase of income arising from 
   an incre ment of investment and the initial new investment itself