periodic
adjective [usually before noun]happening fairly often and regularly 间发性的；定期的；周期的 Periodic checks are carried out on the equipment. 设备定期进行检查。 He makes periodic visits to all the shops which stock his products. 他定期去所有存有他产品的商店。
Oxford Collocations DictionaryPeriodic is used with these nouns:- check
- examination
- fluctuation
- …
Word Originmid 17th cent.: from French périodique, or via Latin from Greek periodikos ‘coming round at intervals’, from periodos ‘orbit, recurrence, course’, from peri- ‘around’ + hodos ‘way, course’.