Period may refer to:
Common uses
*
Period (punctuation)
The full stop (Commonwealth English), period (North American English), or full point is a punctuation mark used for several purposes, most often to mark the end of a declarative sentence (as distinguished from a question or exclamation).
A fu ...
*
Era, a length or span of time
*
Menstruation
Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and Mucous membrane, mucosal tissue from the endometrium, inner lining of the uterus through the vagina. The menstrual cycle is characterized ...
, 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
A historical drama (also period drama, period piece or just period) is a dramatic work set in the past, usually used in the context of film and television, which presents history, historical events and characters with varying degrees of fiction s ...
* 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'' (Kesha album), an upcoming album by Kesha
*
''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
A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that 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), 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
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 ...
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
In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the time that the objec ...
, the time needed for one object to complete a revolution
*
Wavelength
In physics and mathematics, wavelength or spatial period of a wave or periodic function is the distance over which the wave's shape repeats.
In other words, it is the distance between consecutive corresponding points of the same ''phase (waves ...
, the spatial period of a periodic wave
*
Sentence (linguistics)
In linguistics and grammar, a sentence is a Expression (linguistics), 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 expre ...
, 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. They typically last between 30 and 60 minutes, with around 3-10 periods per school day. However, especially in higher education, there can be many more. Educators dete ...
, a class meeting time in schools
*
Period (ice hockey)
Ice hockey (or simply hockey in North America) 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. Two opposing teams use i ...
, 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
* ''
Periodt
Slang used or popularized by Generation Z (Gen Z; generally those born between 1997 and 2012 in the Western world) differs from slang of earlier generations; ease of communication via Internet social media has facilitated its rapid proliferat ...
'', slang of ''period'' used as an interjection
See also
*
. (disambiguation)
*
Duration (disambiguation)
Duration may refer to:
* The amount of time elapsed between two events
* Duration of action, how long a drug produces its effects
* Duration (finance) – the weighted average time until the various cash flows from a security, such as a bond ...
*
Full stop (disambiguation)
The full stop ( Commonwealth English), period (North American English), or full point is a punctuation mark used for several purposes, most often to mark the end of a declarative sentence (as distinguished from a question or exclamation).
A f ...
*
Periodicity (disambiguation)
*
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
*
History by period
Human history or world history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers. They migrated out of Africa during the Last I ...
{{disambiguation