Definition of: ratio

(rā′shō, -shē·ō) noun plural ·tios
1. Relation of degree, number, etc.; relative amount; proportion; rate: There has always been a ratio between demand and supply.
2. The relation between two numbers or two magnitudes of the same kind; especially, the quotient of one magnitude divided by the other, or the factor that, multiplied into one, will produce the other.
3. Formerly, the relation expressed by subtracting one quantity from the other; the difference.
4. Obs. A portion; ration. [<L. Doublet of RATION, REASON.]