Period
Period may refer to: == Common uses == Period (punctuation) Era, length or span of time Periodization, classifying particular lengths of time into distinct historiographic or artistic periods List of time periods History by period Menstruation, commonly referred to as a "period" == Arts, entertainment, and media == Period (music), concept in musical composition Periodic sentence or rhetorical period, concept in grammar and literary style Period drama, dramatic film or television production set in a historical period Period (Another American Lie), 1987 album by B.A.L.L. Period (Kesha album), 2025 Period (mixtape), 2018 City Girls mixtape Period, novel in Dennis Cooper's George Miles cycle Periods., comedy film series == Mathematics == In a repeating decimal, the length of the repetend Period of a function, length or duration after which a function repeats itself Period (algebraic geometry), numbers that can be expressed as integrals of algebraic differential forms over algebraically defined domains, forming a ring == Science == Period (gene), gene in Drosophila involved in regulating circadian rhythm Period (periodic table), horizontal row of the periodic table "Period-" or "per-iod-", chemical prefix where "per" refers to oxidation state and "iod" refers to iodine Unit of time or timeframe Period (geology), subdivision of geologic time Period (physics), the duration of time of one cycle in a repeating event Orbital period, the time needed for one object to complete an orbit around another Rotation period, the time needed for one object to complete a revolution Wavelength, the spatial period of a periodic wave Sentence (linguistics), especially when discussing complex sentences in Latin syntax == Other uses == Period (school), block of time allocated for a specific course or other purpose Playing period, a division of playing time in games and sport Period (ice hockey) Accounting period, often shortened to "period" in business, an accounting timeframe analogous to a month Periodt, slang of period used as an interjection == See also == .