Definition of least common denominator noun from the Oxford Advanced American Dictionary

     

    least common denominator

     noun
    noun
     
    (also lowest common denominator)
     
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  1. 1(mathematics) the smallest number that the bottom numbers of a group of fractions can be divided into exactly
  2. 2(disapproving) something that is simple enough to seem interesting to, or to be understood by, the highest number of people in a particular group; the sort of people who are least intelligent or accept something that is of low quality The school syllabus seems aimed at the least common denominator.
See the Oxford Advanced Learner's Dictionary entry: least common denominator