- Antonyms:
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periodic, periodical
happening or recurring at regular intervals
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cyclic
marked by repeated cycles
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oscillating, oscillatory
having periodic vibrations
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diurnal
having a daily cycle or occurring every day
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daily, day-after-day, day-by-day, day-to-day
of or belonging to or occurring every day
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nightly
happening every night
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hebdomadal, hebdomadary, weekly
of or occurring every seven days
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biweekly, semiweekly
occurring twice a week
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hourly
occurring every hour or payable by the hour
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half-hourly
occurring ever half hour
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biweekly, fortnightly
occurring every two weeks
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annual, yearly
occurring or payable every year
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biannual, biyearly, half-yearly, semiannual
occurring or payable twice each year
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biennial, biyearly
occurring every second year
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triennial
occurring every third year or lasting 3 years
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monthly
of or occurring or payable every month
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bimestrial, bimonthly
occurring every two months
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bimonthly, semimonthly
occurring twice a month
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semestral, semestrial
occurring every six months or during every period of six months
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midweekly
occurring during the middle of the week
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