English dictionary

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English *adjective*: periodical
1.	periodical happening or recurring at regular intervals
		Samples	The periodic appearance of the seventeen-year locust.
		Synonyms	periodic
		Similar	annual, biannual, biennial, bimestrial, bimonthly, bimonthly, biweekly, biweekly, biyearly, biyearly, cyclic, daily, day-after-day, day-by-day, day-to-day, diurnal, fortnightly, half-hourly, half-yearly, hebdomadal, hebdomadary, hourly, midweekly, monthly, nightly, oscillating, oscillatory, semestral, semestrial, semiannual, semimonthly, semiweekly, triennial, weekly, yearly
		Antonyms	aperiodic, nonperiodic

English *noun*: periodical
1.	periodical (communication) a publication that appears at fixed intervals
		Broader (hypernym)	publication
		Narrower (hyponym)	digest, issue, journal, number, organ, pictorial, review, serial, serial publication, series

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