Ratio

1. (n.) The relation which one quantity or magnitude has to another of the same kind. It is expressed by the quotient of the division of the first by the second; thus, the ratio of 3 to 6 is expressed by / or /; of a to b by a/b; or (less commonly) the second term is made the dividend; as, a:b = b/a.
2. (n.) Hence, fixed relation of number, quantity, or degree; rate; proportion; as, the ratio of representation in Congress.