Adjective
Having some regular characteristics.
(geometry, of a polyhedron or tessellation) That is semiregular with regular faces of precisely two types that alternate around each vertex.
(mathematics, ring theory, of an element r of a ring) Such that 1 − r is a unit (has a multiplicative inverse).
(mathematics, mathematical analysis, of a mapping from a multi-dimensional space or manifold to an equivalent space) Having certain properties in common with holomorphic functions of a single complex variable.
(mathematics, representation theory, topological algebra, of a representation) That is the result of a required adjustment of an induced representation that would, unadjusted, give rise to (only) a quasi-invariant measure.
Source: en.wiktionary.org