piecewise
Mathematical term used to describe a function or property defined separately over different intervals or pieces of a domain.
この関数は区分的に定義されている。
This function is defined piecewise.
Use a piecewise linear approximation.
Compound of 区分 (kubun, 'division, section') + 的 (-teki, '-like, -wise'). The combination yields the mathematical sense 'piecewise'.