differential (Adjective) — Relating to or showing a difference. ex. "differential treatment"
differential (Adjective) — (mathematics) involving or containing one or more derivatives. ex. "differential equation"
differential (Noun) — The result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx.
differential (Noun) — A quality that differentiates between similar things.
differential (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.