反はん発ぱつ係けい数すうMeaningsNoun1. coefficient of restitutionKanji used反be against発let out係be involved with数numberComposed of反はん発ぱつopposition; rebellion; revolt; resistance; backlash; refusal; rebounding; recoiling; repulsion; rally (e.g. in stock prices); …Noun係けい数すうcoefficient; factor; proportional constant; modulusNoun