lowest common denominator

lowest common denominator noun
lowest common denominator
noun
Britannica Dictionary definition of LOWEST COMMON DENOMINATOR
[noncount]
1 
mathematics : the smallest number that can be divided exactly by all the numbers below the lines in a group of two or more fractions
— called also (US) least common denominator
2 
disapproving — used to say that the quality of something is poor because it is designed or intended to appeal to the largest possible number of people