coefficient
noun [ C ]
uk/ˌkəʊɪˈfɪʃənt/ usin mathematics, a value that appears in front of and multiplies another value:
In 2x + 4y = 7, 2 is the coefficient of x.
a number or a method of calculating a number that measures the characteristics of a process, event, material, etc.:
The calculation is based on a measure of inequality in disposable income called the Gini coefficient.
The coefficient of diversification measures the extent to which a stock portfolio has been diversified.