| quotient of two numbers or two quantities of the same kind|
Note 1 to entry: The ratio of two quantities of the same kind is a quantity of dimension one. Examples: transfer ratio, signal-to-noise ratio, transformation ratio.
Note 2 to entry: The ratio is expressed by the words “ratio of a to b”.
Note 3 to entry: For the ratio of two quantities, the term “index” is sometimes used in place of ratio. Examples: refractive index, loss index.