微び分ぶん係けい数すうMeaningsNoun1. derivative; differential coefficientKanji used微micro分part係be involved with数numberPitch accentびぶんけいすうびぶんけいすうComposed of微び分ぶんdifferentiation; differential; derivativeNoun係けい数すうcoefficient; factor; proportional constant; modulusNoun