periodical
pe-ri-od-i-cal
noun
A publication, such as a magazine or journal, issued at regular intervals.
"She reads many academic periodicals."
adjective
Occurring or appearing at regular intervals; intermittent or recurrent.
"The patient experienced periodical headaches."
Thesaurus
Synonyms: biennial, triennial, yearly, half-yearly, hebdomadary, bimestrial, cyclic, semimonthly, half-hourly, biyearly, midweekly, periodic
Antonyms: aperiodic, nonperiodic