noun
Mathematical term for a constant factor multiplying a variable or term, e.g., in polynomials or equations.
この式の係数は3です。
The coefficient in this expression is 3.
noun
In physics and chemistry, a constant that relates two quantities, such as a coefficient of friction, expansion, or absorption.
摩擦係数が小さいほど滑りやすい。
The smaller the coefficient of friction, the more slippery it is.
この材料の熱膨張係数を調べてください。
Please look up the thermal expansion coefficient of this material.