denominator

For radioactive elements, “there’s no real common denominator. ... They belong to all different kinds of chemical families,” said Ira Helfand, past president of the International Physicians for the Prevention of Nuclear War.

But even if the true number of cases — the denominator — is five times as high, said Jennifer Nuzzo, director of the Pandemic Center at Brown University, a mortality rate of 10% would be devastating if the bird flu virus evolved to spread swiftly between people.

I think we go with a feeling as a common denominator.

I am the lowest budgetary denominator.

Using the stadium as a common denominator allows the film's timeline to jump back and forth and explore how Sir Elton, and society around him, has changed over the decades.