Synonyms: periodic, occasional
Definition: recurring or reappearing from time to time
Usage: periodic feelings of anxiety
Similar words: sporadic
Definition: recurring in scattered and irregular or unpredictable instances
Usage: a city subjected to sporadic bombing raids
Synonyms: periodic, periodical
Definition: happening or recurring at regular intervals
Usage: the periodic appearance of the seventeen-year locust
Similar words: cyclic
Definition: marked by repeated cycles
Similar words: oscillating, oscillatory
Definition: having periodic vibrations
Similar words: diurnal
Definition: having a daily cycle or occurring every day
Usage: diurnal rotation of the heavens
Similar words: daily, day-after-day, day-by-day, day-to-day
Definition: of or belonging to or occurring every day
Usage: daily routine; a daily paper
Similar words: nightly
Definition: happening every night
Usage: nightly television now goes on until 3:00 or 4:00 a.m.
Similar words: weekly, hebdomadal, hebdomadary
Definition: of or occurring every seven days
Usage: a weekly visit; weekly paper
Similar words: semiweekly, biweekly
Definition: occurring twice a week
Similar words: hourly
Definition: occurring every hour or payable by the hour
Usage: hourly chimes; hourly pay
Similar words: half-hourly
Definition: occurring ever half hour
Similar words: biweekly, fortnightly
Definition: occurring every two weeks
Definition: occurring or payable every year
Usage: an annual trip to Paris; yearly medical examinations; annual (or yearly) income
Similar words: half-yearly, semiannual, biannual, biyearly
Definition: occurring or payable twice each year
Similar words: biennial, biyearly
Definition: occurring every second year
Usage: they met at biennial conventions
Similar words: triennial
Definition: occurring every third year or lasting 3 years
Similar words: monthly
Definition: of or occurring or payable every month
Usage: monthly payments; the monthly newsletter
Similar words: bimestrial, bimonthly
Definition: occurring every two months
Usage: bimonthly visits
Similar words: bimonthly, semimonthly
Definition: occurring twice a month
Usage: a semimonthly publication
Similar words: semestral, semestrial
Definition: occurring every six months or during every period of six months
Similar words: midweekly
Definition: occurring during the middle of the week
Usage: midweekly prayer meetings