British Dictionary definitions for lowest common denominator
lowest common denominator
noun
1.
the smallest integer or polynomial that is exactly divisible by each denominator of a set of fractions Abbreviation LCD, lcd Also called least common denominator
(lō'ĭst) The least common multiple of the denominators of a set of fractions. For example, the lowest common denominator of ^{1}/_{3} and ^{3}/_{4} is 12.
The smallest number that can be divided evenly into two other numbers (seecommon denominator). When fractions with different denominators are added together, their denominators have to be made the same; thus, fractions with denominators of nine and twelve have thirty-six as a lowest common denominator. Seventy-two and 108 are also common denominators for fractions with denominators of nine and twelve, but thirty-six is the lowest.
Note: The term lowest common denominator is often used to indicate a lowering of quality resulting from a desire to find common ground for many people: “This fall's TV programming finds the lowest common denominator of taste.”