WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. periodic (vs. aperiodic), periodical, cyclic, oscillatory, oscillating, diurnal, daily, day-to-day, day-by-day, day-after-day, nightly, weekly, hebdomadal, hebdomadary, semiweekly, biweekly, hourly, half-hourly, fortnightly, biweekly, annual, yearly, semiannual, biannual, biyearly, half-yearly, biennial, biyearly, triennial, monthly, bimonthly, bimestrial, semimonthly, bimonthly, semestral, semestrial, midweekly
- usage: happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"
- 2. periodic, occasional, sporadic (vs. continual)
- usage: recurring or reappearing from time to time; "periodic feelings of anxiety"
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See also: periodic (Dictionary)