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English definition of “ratio”

ratio

noun [C]  /ˈreɪ·ʃIˌoʊ/ (plural ratios) us  
mathematics a comparison of two numbers calculated by dividing Ratio is also a relationship between two groups or amounts that expresses how much bigger one is than the other: a low student-teacher ratio The ratio of men to women at the conference was ten to one.
(Definition of ratio from the Cambridge Academic Content Dictionary © Cambridge University Press)
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