I. |pirē|ädə̇kəl, |pēr-, -dēk- adjective
Etymology: Latin periodic us + English -al
1. : periodic 1
when the bookmobile pulls in for its periodical call — Saturday Review
2.
a. : published with a fixed interval usually longer than a day between the issues or numbers
newspapers and periodical publications
keeping up with the periodical literature on the arts
b. : published in, characteristic of, or connected with a periodical
periodical book reviews
periodical room in a library
II. noun
( -s )
: a magazine or other publication of which the issues appear at stated or regular intervals — usually used of a publication appearing more frequently than annually but infrequently used of a newspaper