Meaning of PERIODICAL in English
Publication whose issues appear at fixed or regular intervals.
Periodicals generally are considered to include newspapers , which usually have large, unfastened pages and contents with considerable immediacy; and magazines , or journals, which have smaller pages, are usually fastened or bound, and often have more specialized, less time-dependent contents.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012