| 单词 | periodic |
| 释义 | periodic (once / 1869 pages) adj Something periodic happens only occasionally, after a "period" of time. Lunch happens every day, after 4th period, so it's safe to say it's periodic. Something periodic doesn't have to happen at regular intervals, though. The word "period" is the key to the meaning of periodic, because something periodic can happen only after a period of time. Periodic visits to the vet are a good way to make sure that your pet stays healthy. Why not just use "occasional," you ask. Good question. Periodic implies that the thing will continue to happen over and over—periodically. Like comets and victories by the Yankees. These things are reliable, if periodic. WORD FAMILYperiodic: nonperiodic, periodicity+/periodicity: periodicities USAGE EXAMPLESA periodic look at my communication with readers. Washington Post(Dec 15, 2016) “This would include annual and multiyear goals, and periodic updates that provide an assessment on progress toward achieving those goals.” Science Magazine(Dec 29, 2016) This is an official “Dark Sky”designated area, with periodic astro-photography workshops to assist you in bringing home a picture of the starry night sky. Washington Times(Dec 21, 2016) 1adj happening or recurring at regular intervals the periodic appearance of the seventeen-year locust Syn|Ant periodical cyclic marked by repeated cycles oscillating, oscillatoryhaving periodic vibrations diurnalhaving a daily cycle or occurring every day daily, day-after-day, day-by-day, day-to-dayof or belonging to or occurring every day nightlyhappening every night hebdomadal, hebdomadary, weeklyof or occurring every seven days biweekly, semiweeklyoccurring twice a week hourlyoccurring every hour or payable by the hour half-hourlyoccurring ever half hour biweekly, fortnightlyoccurring every two weeks annual, yearlyoccurring or payable every year biannual, biyearly, half-yearly, semiannualoccurring or payable twice each year biennial, biyearlyoccurring every second year triennialoccurring every third year or lasting 3 years monthlyof or occurring or payable every month bimestrial, bimonthlyoccurring every two months bimonthly, semimonthlyoccurring twice a month semestral, semestrialoccurring every six months or during every period of six months midweeklyoccurring during the middle of the week aperiodic, nonperiodic not recurring at regular intervals noncyclicnot having repeated cycles nonoscillatorynot having periodic vibrations 2adj recurring or reappearing from time to time periodic feelings of anxiety Syn occasional sporadic recurring in scattered and irregular or unpredictable instances |
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