Webster's English Dictionary

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logarithm

log.a.rithm \'lo.g-*-.rith-*m, 'la:g-\ n [NL logarithmus, fr. log- + Gk 
   arithmos number - more at MARITHMETIC : the exponent that indicates the 
   power to which a number is raised to pro duce a given number {the ~ of 100 
   to the base 10 is 2}