periodical

adj. occurring at regular intervals, recurrent; cyclic; seasonal, periodic

n. magazine, journal

Magazines, periodicals or serials are publications, generally published on a regular schedule, containing a variety of articles, generally financed by advertising, by a purchase price, or both.
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Noun
1. a publication that appears at fixed intervals
(hypernym) publication
(hyponym) digest
Adjective
1. happening or recurring at regular intervals
(synonym) periodic
(similar) cyclic

n. periodical, magazine, journal

(n.)
A magazine or other publication which appears at stated or regular intervals.
  

(a.)
Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
  

(a.)
Of or pertaining to a period; constituting a complete sentence.
  

(a.)
Of or pertaining to a period or periods, or to division by periods.
  

(a.)
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.