At regular intervals; happening repeatedly over time with some predictable pattern. Something that occurs periodically happens again and again with gaps between occurrences.
From Greek 'periodos' meaning 'a going around, cycle' through Latin 'periodicus'. The word evolved from describing astronomical cycles to any recurring pattern. First used in English in the 17th century.
The concept of periodicity is fundamental to understanding everything from atomic structure (periodic table) to women's health (menstrual periods) to economic cycles. Even our sleep follows periodic patterns called circadian rhythms that repeat roughly every 24 hours.
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