The term regular can mean normal or in accordance with rules. It may refer to: People Moses Regular (born 1971), America football player Arts, entertainment, and media Music "Regular" (Badfinger song) Regular tunings of stringed instruments, tunings with equal intervals between the paired notes of successive open strings Other uses in arts, entertainment, and media Regular character, a main character who appears more frequently and/or prominently than a recurring character Regular division of the plane, a series of drawings by the Dutch artist M. C. Escher which began in 1936 Regular Show, an animated television sitcom The Regular Guys, a radio morning show Language Regular inflection, the formation of derived forms such as plurals in ways that are typical for the language Regular verb Regular script, the newest of the Chinese script styles Mathematics There are an extremely large number of unrelated notions of "regularity" in mathematics. Algebra and number theory (See also the geometry section for notions related to algebraic geometry.) Regular category, a kind of category that has similarities to both Abelian categories and to the category of sets Regular chains in computer algebra Regular element (disambiguation), certain kinds of elements of an algebraic structure Regular extension of fields Regular ideal (multiple definitions) Regular monomorphisms and regular epimorphisms, monomorphisms (resp. epimorphisms) which equalize (resp. coequalize) some parallel pair of morphisms Regular numbers, numbers which evenly divide a power of 60 Regular p-group, a concept capturing some of the more important properties of abelian p-groups, but general enough to include most "small" p-groups Regular prime, a prime number p > 2 that does not divide the class number of the p-th cyclotomic field The regular representation of a group G, the linear representation afforded by the group action of G on itself Regular ring, a ring such that all its localizations have Krull dimension equal to the minimal number of generators of the maximal ideal von Neumann regular ring, or absolutely flat ring (unrelated to the previous sense) Regular semi-algebraic systems in computer algebra Regular semigroup, related to the previous sense *-regular semigroup Analysis Borel regular measure Cauchy-regular function (or Cauchy-continuous function,) a continuous function between metric spaces which preserves Cauchy sequences Regular functions, functions that are analytic and single-valued (unique) in a given region Regular matrix (disambiguation) Regular measure, a measure for which every measurable set is "approximately open" and "approximately closed" The regular part, of a Laurent