co·ef·fi·cient
noun/ˌkəʊɪˈfɪʃnt/
/ˌkəʊɪˈfɪʃnt/
- (mathematics) a number that is placed before another quantity and that multiplies it, for example 3 in the quantity 3x
系数 - (physics) 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
- the coefficient of friction
Word Originmid 17th cent. (in the sense ‘cooperating to produce a result’): from modern Latin coefficient-, from com- ‘together’ + efficient- ‘accomplishing’.