Definition of "periodical" []

• Periodic. (adjective)
• Published at regular intervals of more than one day. (adjective)
• Of or relating to a publication issued at such intervals. (adjective)
• A publication issued at regular intervals of more than one day. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Even though I've read most of this material in periodical form, it's still a joy to revisit Kupperman's absurd, hilarious universe."
• "I don't want to sound like I'm an apologist for Diamond, but I do think that some of the rhetoric out there is a little crazy, because really good art comix in periodical form have not been able to get any traction in the comics market for several years."
• "But, don't try to do chapters in periodical format unless you're prepared to meet the scheduled deadlines for those chapters!"