Adjective: periodic ,peer-ee'ó-dik
- Happening or recurring at regular intervals
"the periodic appearance of the seventeen-year locust";
- periodical
- Recurring or reappearing from time to time
"periodic feelings of anxiety";
- occasional
See also: annual, biannual, biennial, bimestrial, bimonthly, biweekly, biyearly, cyclic, daily, day-after-day, day-by-day, day-to-day, diurnal, fortnightly [Brit], half-hourly, half-yearly, hebdomadal, hebdomadary, hourly, midweekly, monthly, nightly, oscillating, oscillatory, semestral, semestrial, semiannual, semimonthly, semiweekly, sporadic, triennial, weekly, yearly
Antonym: aperiodic
Encyclopedia: Periodic