lowest common denominator - definition and synonyms

noun [countable] 

Your browser doesn’t support HTML5 audio

/ˌləʊɪst ˌkɒmən dɪˈnɒmɪˌneɪtə(r)/
singularlowest common denominator
plurallowest common denominators
  1. 2
    maths British the lowest number that can be divided by the bottom numbers of a set of fractions