/ˌkəʊɪˈfɪʃnt ||; ˌkoəˈfɪʃənt/noun[C] 1 (mathematics数学) a number which is placed before another quantity and which multiplies it, for example 3 in the quantity 3x 系数（如3x中的3）
2 (technical术语) a number that measures a particular characteristic of a substance 系数（衡量某种物质特性的数字）: the coefficient of friction/expansion 摩擦╱膨胀系数