differentials

noun

1. 1.The differential gear in an automobile etc
2. 2.A qualitative or quantitative difference between similar or comparable things
3. 3.An infinitesimal change in a variable, or the result of differentiation
4. 4.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.
5. 5.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.