de·nom·i·na·tor /dɪˈnɑməˌnetɚ/
  分母,命名者
  denominator
  分母
  denominator
  分母
  De·nom·i·na·tor n.
  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 common fractions which shows into how many parts the integer or unit is divided.
  Note: ☞ Thus, in ⅗, 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.
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  denominator
       n : the divisor of a fraction