Definition from macmillandictionary.com

noun [countable]

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singular | common denominator |

plural | common denominators |

- 1a feature that everyone or everything in a particular group has
The common denominator in all his novels is the use of the supernatural.

Synonyms and related words - 2maths a number that can be divided exactly by all the denominators (=numbers written below the line) in a particular group of fractions. The common denominator of 1/4, 1/3, and 1/6 is 12.Synonyms and related words