proportional - one of the quantities in a mathematical proportion

case-fatality proportion - the number of cases of a disease ending in death divided by the number of cases of the disease; usually expressed as a percentage or as the number of deaths per 1000 cases

case-to-infection proportion, case-to-infection ratio - the number of cases of a disease divided by the number of infections with the agent that causes the disease

content - the proportion of a substance that is contained in a mixture or alloy etc.

scale - the ratio between the size of something and a representation of it; "the scale of the map"; "the scale of the model"

golden mean, golden section - the proportional relation between two divisions of line or two dimension of a plane figure such that short : long :: long : (short + long)

commensurateness, proportionateness, correspondence - the relation of correspondence in degree or size or amount

pct, per centum, percent, percentage - a proportion multiplied by 100

batting average - (an extension of the baseball term) the proportion of times some effort succeeds; "the salesman's batting average was 7 out of 12"

quotient - the ratio of two quantities to be divided