0 the smallest number that can be exactly divided by all the bottom numbers in a group of fractions --
1 used to refer in a disapproving way to the sort of people in society who are least intelligent and who will accept low-quality products and entertainment: --
The problem with so much television is that it is aimed at the lowest common denominator.
2 the large number of people who will accept products, ideas, etc. that are not good quality: --