Period

Period and periodic may refer to:

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• Period (music)
• Period (rhetoric)
• Historical period
• Menstrual cycle, relating to the reproductive system
• full stop, also known as a period, that marks the end of a sentence

Science and Mathematics:

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• Orbital period, in astronomy
• Periodic table, in chemistry
• Periodic table period, in chemistry
• Periodic acid, in chemistry
• Geologic period, in geology
• Periodic function, in mathematics
• Recurring decimal, in mathematics
• In physics, a period is an interval of time between the recurrence of phases in a vibration, etc.