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 distinguished from a question or exclamatio ...
(or period), a punctuation mark
Arts, entertainment, and media
*
Period (music)
In music, the term period refers to certain types of recurrence in small-scale formal structure. In twentieth-century music scholarship, the term is usually used as defined by the ''Oxford Companion to Music'': "a period consists of two phrase ...
, a concept in musical composition
*
Periodic sentence A periodic sentence is a sentence with a stylistic device featuring syntactical subordination to a single main idea, which usually is not complete until the very end of the sentence. The periodic sentence emphasizes its main idea by placing it at ...
(or rhetorical period), a concept in grammar and literary style.
* 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 romance film, romances, adventure f ...
* 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 digits are periodic (repeating its values at regular intervals) and the infinitely repeated portion is not zero. It can be shown that a number is rational i ...
, 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)
Period (per) is a gene located on the X chromosome of '' Drosophila melanogaster''. Oscillations in levels of both ''per'' transcript and its corresponding protein PER have a period of approximately 24 hours and together play a central role in th ...
, a gene in ''Drosophila'' involved in regulating circadian rhythm
*
Period (periodic table)
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, elements ...
, 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
Iodine is a chemical element with the Symbol (chemistry), symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , ...
*
Menstruation
Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of ...
, also called a "period"
*
Unit of time
A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as a ...
or timeframe
**
Period (geology)
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochr ...
, a subdivision of geologic time
**
Period (physics)
Period may refer to:
Common uses
* Era, a length or span of time
* Full stop (or period), a punctuation mark
Arts, entertainment, and media
* Period (music), a concept in musical composition
* Periodic sentence (or rhetorical period), a concept ...
, the duration of time of one cycle in a repeating event
**
Orbital period
The orbital period (also revolution period) is the amount of time a given astronomical object takes to complete one orbit around another object. In astronomy, it usually applies to planets or asteroids orbiting the Sun, moons orbiting pla ...
, the time needed for one object to complete an orbit around another
**
Rotation period
The rotation period of a celestial object (e.g., star, gas giant, planet, moon, asteroid) may refer to its sidereal rotation period, i.e. the time that the object takes to complete a single revolution around its axis of rotation relative to the ...
, the time needed for one object to complete a revolution
*
Wavelength
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, tr ...
, the spatial period of a periodic wave
*
Sentence (linguistics)
In linguistics and grammar, a sentence is a linguistic expression, such as the English example " The quick brown fox jumps over the lazy dog." In traditional grammar, it is typically defined as a string of words that expresses a complete thought, ...
, especially when discussing complex sentences in Latin syntax
Other uses
*
Period (school)
A school period is a block of time allocated for lessons/classes in schools and colleges. They typically last between 30 and 120 minutes, with around 3-10 periods per school day. However, especially in higher education, there can be many more. Ed ...
, a class meeting time in schools
*
Period (ice hockey)
Ice hockey (or simply hockey) is a team sport played on ice skates, usually on an ice skating rink with lines and markings specific to the sport. It belongs to a family of sports called hockey. In ice hockey, two opposing teams use ice ho ...
, a division of play in an ice hockey game
*
Accounting period
An accounting period, in bookkeeping, is the period with reference to which management accounts and financial statements are prepared.
In management accounting the accounting period varies widely and is determined by management. Monthly accoun ...
, often shortened to "period" in business, an accounting timeframe analogous to a month
See also
*
Duration (disambiguation)
Duration may refer to:
* The amount of time elapsed between two events
* Duration (music) – an amount of time or a particular time interval, often cited as one of the fundamental aspects of music
* Duration (philosophy) – a theory of time an ...
*
Full stop (disambiguation)
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 distinguished from a question or exclamation ...
*
Periodicity (disambiguation)
Periodicity or periodic may refer to:
Mathematics
* Bott periodicity theorem, addresses Bott periodicity: a modulo-8 recurrence relation in the homotopy groups of classical groups
* Periodic function, a function whose output contains values tha ...
*
Periodization
In historiography, periodization is the process or study of categorizing the past into discrete, quantified, and named blocks of time for the purpose of study or analysis.Adam Rabinowitz. It's about time: historical periodization and Linked Ancie ...
*
List of time periods
The categorisation of the past into discrete, quantified named blocks of time is called periodization.Adam Rabinowitz. And kingIt’s about time: historical periodization and Linked Ancient World Data'. Study of the Ancient universe Papers, 2014 ...
*
History by period
Human history, also called world history, is the narrative of humanity's past. It is understood and studied through anthropology, archaeology, genetics, and linguistics. Since the invention of writing, human history has been studied through ...
{{disambiguation