Meaning of RATIO in English

RATIO

/ ˈreɪʃiəʊ; NAmE -oʊ/ noun

( pl. -os ) ratio (of A to B) the relationship between two groups of people or things that is represented by two numbers showing how much larger one group is than the other :

What is the ratio of men to women in the department?

The school has a very high teacher-student ratio.

The ratio of applications to available places currently stands at 100:1.

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WORD ORIGIN

mid 17th cent.: from Latin , literally reckoning , from rat- reckoned, from the verb reri .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.