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mathematics 数学 a number that is placed before another quantity and that multiplies it, for example 3 in the quantity 3x 系数 - (
physics 物理 a number that measures a particular property (= characteristic) of a substance （测定物质某种特性的）系数 the coefficient of friction 摩擦系数
Word Originmid 17th cent. (in the sense ‘cooperating to produce a result’): from modern Latin coefficient-, from com- ‘together’ + efficient- ‘accomplishing’.