Webster's English Dictionary

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denominator

de.nom.i.na.tor \di-'na:m-*-.na-t-*r\ n 1: the part of a fraction that is 
   below the line signifying division and th at in fractions with 1 as the 
   numerator indicates into how many parts the unit is divided : DIVISOR 2a: a 
   common trait  2b: the average level : STANDARD