noun: a quality that differentiates between similar things
noun: 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
noun: the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
adjective: relating to or showing a difference
Example: "Differential treatment"
adjective: involving or containing one or more derivatives