common denominator

/K AA1 M AH0 N D IH0 N AA1 M AH0 N EY0 T ER0/
noun
  1. 1

    Any integer that is a common multiple of the denominators of two or more fractions.

  2. 2

    (by extension) A trait or attribute that is shared by all members of some category.

Source: https://en.wiktionary.org/wiki/common%20denominator