The dictionary tells me that they both mean "periodic" so I can't actually
understand the difference. Can someone help me? Thank you so much!
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2022-11-09T03:16:29.390
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2022-11-09T03:37:47.087
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question
word-choice
「周期的」と「定期的」はどう違いますか
定期的 is usually about human and societal things. If something is not
particularly associated with calendar months and years, like a natural
phenomenon, 周期的 would be better.

"first weekday of every month" is more 定期的 than 周期的. "every 1 millisecond" is
more 周期的 than 定期的.

It can be a matter of perspectives, though. When a scientist observes a human
behavior, they might use 周期的.
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2022-11-09T03:37:47.087
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answer