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).StatisticsNumerical relationships

(Definition of ratio noun from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)

Focus on the pronunciation of ratio
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“ratio”: synonyms and related words:

the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

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