What is the meaning of differential?

noun

• The result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx.
  • synonyms: derived function, derivative, differential coefficient, first derivative
• A quality that differentiates between similar things.
• 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.
  • synonyms: differential gear

adjective

• Relating to or showing a difference.
  • usage: "differential treatment"
• Involving or containing one or more derivatives.
  • usage: "differential equation"