ˌlowest ˌcommon deˈnominator noun [uncountable]

1. the biggest possible number of people, including people who are very easily influenced or are willing to accept low standards:
Television quiz shows often seem to target the lowest common denominator.

2. technical the smallest number that the bottom numbers of a group of fractions can be divided into exactly ⇒ denominator

[TahlilGaran] Dictionary of Contemporary English ▲

lowest common denominator
the large number of people in society who will accept low-quality products and entertainment.
The problem with so much television is that it aims at the lowest common denominator.

[TahlilGaran] English Idioms Dictionary ▲