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"

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

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

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