differential

Adjective

• of, or relating to a difference
• dependent on, or making a difference; distinctive
• having differences in speed or direction of motion
• of, or relating to differentiation, or the differential calculus

Noun

• the differential gear in an automobile etc
• a qualitative or quantitative difference between similar or comparable things
• an infinitesimal change in a variable, or the result of differentiation
• One of two coils of conducting wire so related to one another or to a magnet or armature common to both, that one coil produces polar action contrary to that of the other.
• A form of conductor used for dividing and distributing the current to a series of electric lamps so as to maintain equal action in all.