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Adjective: periodic  ,peer-ee'ó-dik
  1. Happening or recurring at regular intervals
    "the periodic appearance of the seventeen-year locust";
    - periodical
     
  2. 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