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English definition of “ratio”

ratio

noun [C]     /ˈreɪ.ʃi.əʊ/ US  /-oʊ/ (plural ratios)
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)
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