total differential; total derivative
Mathematical term used in multivariable calculus. Refers to the differential of a function of several variables, or the derivative taken with respect to all variables.
The total differential expresses the change of a multivariable function.
Compound of 全 (ぜん, 'total, whole') and 微分 (びぶん, 'differential, derivative'). The term is a direct calque from English 'total differential' or 'total derivative'.