piecewise linear

Adjective

 * 1)  Equal to a sum of finitely many linear functions, each defined on a convex polytope: said of functions between vector spaces
 * 2)  Having a defining atlas such that there is a piecewise linear homeomorphism between any pair of intersecting atlas charts: said of manifolds

Translations

 * Finnish: paloittain lineaarinen
 * Icelandic: línulegur á köflum
 * Russian: кусо́чно-лине́йный