C1 the relationship between two groups or amounts, which expresses how much bigger one is than the other: The ratio of men to women at the conference was ten to one/10:1. The school is trying to improve its pupil-teacher ratio (= the number of teachers compared with the number of students).

More examples

- Compute the ratio of the object's height to its weight.
- What is the car's power to weight ratio?
- The staff to student ratio has increased dramatically in the last five years.
- The efficiency of a machine is the ratio between the energy it supplies and the energy put into it.
- Pi is the ratio of a circle's circumference to its diameter.

in Spanish | proporción… |

in French | proportion… |

in German | das Verhältnis… |

in Chinese (Traditional) | 比, 比例, 比率… |

in Russian | соотношение… |

in Turkish | oran, nispet… |

in Chinese (Simplified) | 比, 比例, 比率… |

in Polish | stosunek, proporcja… |

(Definition of ratio from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

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April 15, 2015

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