Having a period; performed in a fixed period or cycle; appearing, occurring, or happening at stated intervals; regularly or statedly recurring at the end of a fixed period of time: as, periodical diseases; periodical publications.
Of or pertaining to magazines, newspapers, or other publications which appear or are published at regularly recurring intervals.
noun.
A publication issued at regular intervals in successive numbers or parts, each of which (properly) contains matter on a variety of topics, and no one of which is contemplated as forming a book by itself.