periodic

1. Happening or recurring at regular intervals (synset 301974305)
   "the periodic appearance of the seventeen-year locust"
   similar to:

   • cyclic - marked by repeated cycles
   • oscillating, oscillatory - having periodic vibrations
   • diurnal - having a daily cycle or occurring every day
   • daily, day-after-day, day-by-day, day-to-day - of or belonging to or occurring every day
   • nightly - happening every night
   • hebdomadal, hebdomadary, weekly - of or occurring every seven days
   • biweekly, semiweekly - occurring twice a week
   • hourly - occurring every hour or payable by the hour
   • half-hourly - occurring ever half hour
   • biweekly, fortnightly - occurring every two weeks
   • annual, yearly - occurring or payable every year
   • biannual, biyearly, half-yearly, semiannual - occurring or payable twice each year
   • biennial, biyearly - occurring every second year
   • triennial - occurring every third year or lasting 3 years
   • monthly - of or occurring or payable every month
   • bimestrial, bimonthly - occurring every two months
   • bimonthly, semimonthly - occurring twice a month
   • semestral, semestrial - occurring every six months or during every period of six months
   • midweekly - occurring during the middle of the week
   same as: periodical
2. Recurring or reappearing from time to time (synset 300596641)
   "periodic feelings of anxiety"
   similar to: sporadic - recurring in scattered and irregular or unpredictable instances
   same as: occasional

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