\Co`ef*fi"cient\, a.
Co["o]perating; acting together to produce an effect.
{Co`ef*fi"cient*ly}, adv.

\Co`ef*fi"cient\, n.
1. That which unites in action with something else to produce
   the same effect.
2. [Cf. F. coefficient.] (Math.) A number or letter put
   before a letter or quantity, known or unknown, to show how
   many times the latter is to be taken; as, 6x; bx; here 6
   and b are coefficients of x.
3. (Physics) A number, commonly used in computation as a
   factor, expressing the amount of some change or effect
   under certain fixed conditions as to temperature, length,
   volume, etc.; as, the coefficient of expansion; the
   coefficient of friction.
{Arbitrary coefficient} (Math.), a literal coefficient placed
   arbitrarily in an algebraic expression, the value of the
   coefficient being afterwards determined by the conditions
   of the problem.