Moving image genre-form guide online, February 25, 2008 (Television series: a multi-episode program originally conceived with an indefinite duration, shown on a regular schedule (daily, weekly, monthly) or irregular basis (such as TALKING WITH DAVID FROST or NATIONAL GEOGRAPHIC SOCIETY SPECIALS). Episodes of a television series are usually related by subject matter, hosts, or, in the case of fictional programs, continuing characters in a predictable milieu)

Yee, M. M. Moving image materials, 1988: p. 87 (Series: used for a program or film in a number of episodes or parts which has a story line which continues from one episode or part to the next. RT: Anthologies; Made for TV movies; Mini-series; Serials; Specials)

Archival moving image materials : a cataloging manual, 2000: Glossary, p. 31 (Television series: a group of programs created or adapted for television broadcast with a common series title, usually related to one another in subject or another way. Often, television series appear once a week during a prescribed time slot; however, they may appear with more or less frequency. Television series are usually created to be open-ended, not with a predetermined number of episodes. In a fiction series, the programs typically share the same characters and basic themes)