lowest common denominator

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lowest common denominator ‎(plural lowest common denominators)

  1. (mathematics) The smallest positive integer which is a multiple of every denominator of several fractions.
    The lowest common denominator of 1/6 and 3/10 is 30.
  2. (figuratively) The most simple or base shared interest or characteristic among a group or collection of people etc.
    Reality TV really is appealing to the lowest common denominator in audiences.

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