Regular may refer to: 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. Language. Regular inflection, the formation of derived forms such as plurals in ways that are typical for the language.
https://en.wikipedia.org/wiki/Regular