common denominator

American  

noun

1. Mathematics. a number that is a multiple of all the denominators of a set of fractions.

2. a trait, characteristic, belief, or the like common to or shared by all members of a group.

   Dedication to the cause of freedom was the common denominator of the American revolutionaries.

---

common denominator British  

noun

1. an integer exactly divisible by each denominator of a group of fractions: 1/ 3 , 1/ 4 , and 1/ 6 have a common denominator of 12

2. a belief, attribute, etc, held in common by members of a class or group

---

common denominator Scientific  

1. A quantity into which all the denominators of a set of fractions may be divided without a remainder. For example, the fractions 1/3 and 2/5 have a common denominator of 15.

---

common denominator Cultural  

1. A number that will allow fractions with different denominators to be converted into fractions with the same denominator, so that these fractions can be added or subtracted. The fractions can be expressed as whole numbers divided by the common denominator. Thus, 12 is a common denominator for 1/3 and 1/4, since they can be written as 4/12 and 3/12, respectively. (See lowest common denominator.)

---

Discover More

Figuratively, a common denominator is a common factor in different events: “The common denominator in these crimes is the use of inside knowledge of computer systems.”

Etymology

Origin of common denominator

First recorded in 1585–95

Example Sentences

See Examples For:

common denominator

I found, unsurprisingly, that the steps people have taken vary quite significantly, but they all have one common denominator: The greens are cooked—in more ways than one.

From Slate ● Jul. 17, 2026

Szymanski observes that the vast majority of successful footballing nations share another common denominator: wealth.

From BBC ● Jul. 4, 2026

Many have dismissed the fruity videos as so-called artificial intelligence "slop" -- poor-quality content churned out to appeal to the lowest common denominator.

From Barron's ● Apr. 3, 2026

Sports, at its finest, can act as a cultural common denominator for our ever-fractious and divided polity.

From Los Angeles Times ● Feb. 27, 2026

Because he thinks Facebook is the lowest common denominator of social discourse.

From "Simon vs. the Homo Sapiens Agenda" by Becky Albertalli