| Share    Pronunciation: (dif"u-ren'shul), [key] 1. of or
pertaining to difference or diversity. 2. constituting a
difference; distinguishing; distinctive: a differential feature.
3. exhibiting or depending upon a difference or distinction. 4.
Physics, Mach.pertaining to or involving the difference of two
or more motions, forces, etc. 5. Math.pertaining to or involving
a derivative or derivatives.  2. Also called differential gear.
Mach.an epicyclic train of gears designed to permit two or more
shafts to rotate at different speeds, as a set of gears in an
automobile permitting the rear wheels to be driven at different
speeds when the car is turning. 3. Math. a. a function of two
variables that is obtained from a given function, y = f(x), and
that expresses the approximate increment in the given function
as the derivative of the function times the increment in the
independent variable, written as dy = f'(x)dx. b. any
generalization of this function to higher dimensions. 4. Com. a.
the difference involved in a