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English definition of “periodic”

periodic

adjective [not gradable]  /ˌpɪər·iˈɑd·ɪk/ us  

periodic adjective [not gradable] (REPEATED EVENT)

science happening repeatedly in a fixed pattern

periodic adjective [not gradable] (TIME)

(also periodical,  /ˌpɪər·iˈɑd·ɪ·kəl/) happening repeatedly although not necessarily frequently: He suffers periodic mental breakdowns. physics (also periodical,  /ˌpɪər·iˈɑd·ɪ·kəl/) A pattern or other event is periodic if it repeats at periods of time that are equal.
(Definition of periodic from the Cambridge Academic Content Dictionary © Cambridge University Press)
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