Origin: Latin suffix -al
Periodical has 4 different meanings across 2 categories:
a publication that appears at fixed intervals
"The local library updated its collection of periodicals to include the latest issues from every month and week."
A publication issued regularly, but less frequently than daily.
"She subscribed to a periodical that delivers new issues of fashion and travel magazines once every month."
happening or recurring at regular intervals
"the periodic appearance of the seventeen-year locust"
Periodic.
"The periodical maintenance schedule requires us to inspect the server room every three months."