S: (n) differential (a quality that differentiates between similar things)
S: (n) 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)
Adjective
S: (adj) differential (relating to or showing a difference) "differential treatment"
S: (adj) differential (involving or containing one or more derivatives) "differential equation"