Longman Dictionary of Contemporary English homepage

common denominator

common denominator [countable]
1MI an attitude or quality that all the different members of a group have:
The common denominator of both types of novel is the vulnerable, threatened heroine.

the lowest common denominator

the least attractive, least intelligent people or features in a situation:
trashy TV programs that appeal to the lowest common denominator
3HMN technical a number that can be divided exactly by all the denominators (=bottom number) in a set of fractions

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