differential -- (a quality that differentiates between similar things)
differential gear, differential -- (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)
Overview of adj differential
The adj differential has 2 senses
differential -- (relating to or showing a difference; "differential treatment")
differential -- (involving or containing one or more derivatives; "differential equation")