Period

Period may refer to:

Common uses

 * Period (punctuation)
 * Era, a length or span of time
 * Menstruation, commonly referred to as a "period"

Arts, entertainment, and media

 * Period (music), a concept in musical composition
 * Periodic sentence (or rhetorical period), a concept in grammar and literary style.
 * Period, a descriptor for a historical or period drama
 * 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
 * Periods., a 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), 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
 * 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
 * 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), a class meeting time in schools
 * Period (ice hockey), a division of play in an ice hockey game
 * Accounting period, often shortened to "period" in business, an accounting timeframe analogous to a month
 * Periodt, slang of period used as an interjection