Ratio - 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.
Ratio - n. Hence, fixed relation of number, quantity, or degree; rate;
proportion; as, the ratio of representation in Congress.