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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 common denominator of both types of novel is the vulnerable, threatened heroine.2 the least attractive, least intelligent people or features in a situation :
trashy TV programs that appeal to the lowest common denominator
the lowest common denominator
trashy TV programs that appeal to the lowest common denominator3HMN technical a number that can be divided exactly by all the denominators (=bottom number) in a set of fractions

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