and '''periodic''' may refer to:
- Periodic Function
- Recurring Decimal
- In a Group , the Period of an element ''a'' is the smallest integer ''n'' such that ''a''''n'' = ''e'', the identity.
- In Physics , a Period is an interval of time between the recurrence of phases in a vibration, etc. This general sense applies to many of the above.
Period is also the name of the final novel in Dennis Cooper's George Miles Cycle.
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