differential in WordNet English dictionary

1. the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
   derived function  derivative  differential coefficient  differential  first derivative 
   
2. 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
   differential gear  differential 
   
3. a quality that differentiates between similar things
   differential 
   

1. relating to or showing a difference
   "differential treatment"
   differential 
   
2. involving or containing one or more derivatives
   "differential equation"
   differential