- a factor that contributes to produce a result
- Math. a number or algebraic symbol prefixed as a multiplier to a variable or unknown quantity (Ex.:
*x*in*x(y+z),**6*in*6ab*) - Physics a number, constant for a given substance, used as a multiplier in measuring the change in some property of the substance under given conditions: the
*coefficient*of expansion

Origin of coefficient

co- + efficient: origin, originally an adjective meaning “cooperating”