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Definition of ratio:
 Hence, fixed relation of number, quantity, or degree; rate; proportion; as, the ratio of representation in Congress.
 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.
Synonyms:
quota, symmetry, backlog, amount, allowance, dimension, rate, balance, degree, quotient, block, allocation, accumulation, proportion, capacity, arithmetic, batch, proportionality.
Usage examples:

You will perceive that the increase of numbers during the last 10 years, proceeding in geometric ratio, promises a duplication in little more than 22 years.
 "State of the Union Addresses of Thomas Jefferson", Thomas Jefferson. 
Relative humidity is simply the ratio of the actual vapor pressure present in a given space to the vapor pressure when the space is saturated with vapor at the given temperature.
 "Seasoning of Wood", Joseph B. Wagner. 
That probability ratio is zero.
 "Prologue to an Analogue", Leigh Richmond.