Meaning of “periodic” in the English Dictionary

"periodic" in American English

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periodicadjective [ not gradable ]

us /ˌpɪər·iˈɑd·ɪk/

periodic adjective [ not gradable ] (REPEATED EVENT)

periodic adjective [ not gradable ] (TIME)

also periodical, /ˌpɪər·iˈɑd·ɪ·kəl/ happening repeatedly although not necessarily frequently:

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)