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Definition of periodical : 1. A magazine or other publication which appears at stated or regular intervals.
2. Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics.
3. Of or pertaining to a period or periods, or to division by periods.
4. Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.

Synonyms:

steady, frequent, periodic, from time to time, at regular times, recurrent, weekly, compact, comic, hourly, isochronous, spasmodic, occasionally, repeated, episodic, occasional, yearly, back copy, at various times, cyclical, biweekly, at predetermined times, fluctuating, daily, repetition, cyclic, recurring, intermittent, rhythmic, comic book, regular, habitual, fitful, back number, (every) now and then/again, oscillating, centennial, oscillatory, annual, infrequent, at fixed intervals, brochure, orbital, serialized, perennial, serial, constant, pulsed, at regular intervals, sometimes, on certain occasions, continue, monthly, on-and-off, back issue, sporadic, pendulumlike, isochronal, alternate, every so often, continual, broadsheet

gazette, newspaper, propaganda, post, report, dissemination, bulletin, newsletter, promulgation, advertisement, publication, herald, newsmagazine, handbill, brief, notice, circular, promotion, journalism, commercial, journal, review, broadcast, announcement, organ

Usage examples:

• She has also written on the woman question, and contributed largely to periodical literature. - "A Biographical Dictionary of Freethinkers of All Ages and Nations", Joseph Mazzini Wheeler.
• Ryder continued: In his experience such waves of reform were periodical and soon wear themselves out, when things go on just as they did before. - "The Lion and the Mouse A Story of an American Life", Charles Klein.
• He passed through the halls which were filled with tables at which old men were playing whist; turned into the " infernal region," where the famous " Puchin" had begun his game against the " company;" stood for awhile near one of the billiard- tables, where, holding on to the cushion, a distinguished old man was fumbling around and with difficulty striking a ball; looked into the library, where a general, holding a newspaper a distance away from him, was reading it slowly above his glasses, and a registered young man turned the leaves of one periodical after another, trying to make no noise; and finally seated himself on a divan in the billiard- room, near some young people who were playing pyramids, and who were as much gilded as he was. - "Fables for Children, Stories for Children, Natural Science Stories, Popular Education, Decembrists, Moral Tales", Leo Tolstoy.