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Period

Period or '''periodic''' may refer to:

- Full stop, a punctuation mark indicating the end of a sentence or phrase
- Periodic sentence, a sentence that is not grammatically complete until its end
- The final book in Dennis Cooper#George Miles cycle|Dennis Cooper's George Miles cycle of novels
- Period piece describes creative works set in a particular era.

- Menstruation, a phase of the menstrual cycle in which the uterine lining is shed
- Orbital period, a concept in astronomy.
- Period (gene), a gene in Drosophila involved in regulating circadian rhythm
- Period (geology), a subdivision of geologic time
- The period of a periodic function
- Period (number), a concept in mathematics
- Period (periodic table), a horizontal row of the periodic table
- Periodic acid, an oxoacid of iodine
- Period (physics), the reciprocal of frequency
- Orbit (dynamics) | Period of orbit

- Period (music), a concept in musical composition
- Periodicity, the quality of occurring at regular intervals
- For historical period, see List of time periods

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