in physics, of quantitative differences, or producing effects by reason of quantitative differences

in mathematics, relating to a differential or differentiation

the amount of a difference between comparable individuals or classes; specif the amount by which the remuneration of distinct types of worker differs

in mathematics, the product of the derivative of a function of one variable with the increment of the independent variable

For a function f(x) the differential is f´(x)dx

= differential gear