Definition of periodic adjective from the Oxford Advanced Learner's Dictionary

  

periodic

 adjective
adjective
BrE BrE//ˌpɪəriˈɒdɪk//
 
; NAmE NAmE//ˌpɪriˈɑːdɪk//
 
(less frequent periodical
BrE BrE//ˌpɪəriˈɒdɪkl//
 
; NAmE NAmE//ˌpɪriˈɑːdɪkl//
 
)
[usually before noun]
 
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happening fairly often and regularly Periodic checks are carried out on the equipment. He makes periodic visits to all the shops which stock his products. Word Origin mid 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’.
See the Oxford Advanced American Dictionary entry: periodic

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