Meaning of RATIO in English

RATIO

n. (pl. -os) the quantitative relation between two similar magnitudes determined by the number of times one contains the other integrally or fractionally (in the ratio of three to two; the ratios 1:5 and 20:100 are the same).

[ L (as RATE(1)) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.