lowest common denominator

/L OW1 AH0 S T K AA0 M AH0 N D IH0 N AA0 M AH0 N EY0 T ER0/
noun
  1. 1

    The smallest positive integer which is a multiple of every denominator of several fractions.

  2. 2

    The most simple or base shared interest or characteristic among a group or collection of people etc.

    โ€œReality TV really is appealing to the lowest common denominator in audiences.โ€

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