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