2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Denominator  \De*nom"i*na`tor\,  n.  [Cf.  F.  d['e]nominateur.] 
  1.  One  who  or  that  which  gives  a  name  origin  or  source  of 
  a  name 
 
  This  opinion  that  Aram  .  .  .  was  the  father  and 
  denomination  of  the  Syrians  in  general.  --Sir  W. 
  Raleigh. 
 
  2.  (Arith.)  That  number  placed  below  the  line  in  vulgar 
  fractions  which  shows  into  how  many  parts  the  integer  or 
  unit  is  divided. 
 
  Note:  Thus  in  3/5,  5  is  the  denominator,  showing  that  the 
  integer  is  divided  into  five  parts  and  the  numerator, 
  3,  shows  how  many  parts  are  taken 
 
  3.  (Alg.)  That  part  of  any  expression  under  a  fractional  form 
  which  is  situated  below  the  horizontal  line  signifying 
  division. 
 
  Note:  In  this  sense  the  denominator  is  not  necessarily  a 
  number,  but  may  be  any  expression,  either  positive  or 
  negative,  real  or  imaginary.  --Davies  &  Peck  (Math. 
  Dict.  ) 
 
  From  WordNet  r  1.6  [wn]: 
 
  denominator 
  n  :  the  divisor  of  a  fraction 

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