1.the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
2.a quality that differentiates between similar things
3.a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
4.relating to or showing a difference;
differential treatment
5.involving or containing one or more derivatives;
differential equation