"performed or happening at regular or stated intervals," c. 1600, from periodic + -al (1). As a noun meaning "publication issued at regular intervals," it is attested from 1798. Related: Periodically.
Entries linking to periodical
periodic adj.
"proceeding in a series of successive revolutions; pertaining to or of the nature of a cycle or period" 1640s, from French périodique (14c.), from Late Latin periodicus "that returns at stated intervals of time," from Latin periodus "recurring portion, cycle" (see period). From 1660s as "occurring at regular intervals of time."
The periodic table in chemistry (1889) is so called for the arrangement, in which similar properties recur at intervals in elements in the same area as you read down the rows of the table. This sense of the word is attested from 1872 (periodic law).
-al 1
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).