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Period may refer to:


Common uses

* Era, a length or span of time *
Full stop The full stop ( Commonwealth English), period ( North American English) or full point is a punctuation mark. It is used for several purposes, most often to mark the end of a declarative sentence (as opposed to a question or exclamation); this ...
(or period), a punctuation mark


Arts, entertainment, and media

* Period (music), a concept in musical composition * Period, a descriptor for a historical or
period drama A historical drama (also period drama, costume drama, and period piece) is a work set in a past time period, usually used in the context of film and television. Historical drama includes historical fiction and romances, adventure films, and sw ...
* Period, a timeframe in which a particular style of antique furniture or some other work of art was produced, such as the "Edwardian period" * '' Period (Another American Lie)'', a 1987 album by B.A.L.L. * ''Period'' (mixtape), a 2018 mixtape by City Girls * ''Period'', the final book in Dennis Cooper's George Miles cycle of novels


Mathematics

* In a
repeating decimal A repeating decimal or recurring decimal is decimal representation of a number whose Numerical digit, digits are periodic function, periodic (repeating its values at regular intervals) and the infinity, infinitely repeated portion is not zero. It c ...
, 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), a gene in ''Drosophila'' involved in regulating circadian rhythm * Period (periodic table), a horizontal row of the periodic table * "Period-" or "per-iod-", in some chemical compounds, "per" refers to oxidation state, and "iod" refers to the compound containing iodine *Menstruation, also called a "period" * Unit of time or timeframe **Period (geology), a 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 * Wavelength, the spatial period of a periodic wave *Sentence (linguistics), especially when discussing complex sentences in Latin syntax


Other uses

* Period (school), a class meeting time in schools * Ice hockey#Periods and overtime, Period, a professional ice hockey game comprises three periods of 20 minutes, with the clock running only when the puck is in play (similar uses occur in some other sports)


See also

* Duration (disambiguation) * Full stop (disambiguation) * Periodicity (disambiguation) * Periodization {{disambiguation