PERIOD

Look up period in Wiktionary, the free dictionary.

Look up periodic in Wiktionary, the free dictionary.

Period and periodic may refer to:

1. Full stop, also known as a period, that marks the end of a sentence.
2. An interval of time that an event, chain of events, instance or happening, takes place within. It is measured between a start point and an end point and generally repeats, or progresses, in a cycle with the end point of one period being the start point of the next.

Business

• In business, particularly accounting, a period is the time interval(s) that the accounts, statement, payments, or other calculations cover. The interval may vary depending on the on the situation. e.g. Payments, Receipts, Taxes - annually, quarterly or monthly. Salary or wages - monthly, fortnightly or weekly.

Education

• In schools, a period is the time allocated in the school timetable for instruction in a particular subject. While a study period is time where students are intended to undertake self directed study.

History

• Historical period

Performing Arts

• Period piece

Music

• Period (music)

Philosophy

• Periodic sentence

Science

• Periodization, is the attempt to categorize or divide time, or history, into discrete named blocks.

Biology

• Menstrual cycle, relating to the reproductive system

Chemistry

• Periodic acid, The name is not derived from period, but from iodine: per-iodic acid.
• Periodic table, a table of the chemical elements arranged based on their chemical and physical similarities and differences.
• Periodic table period, which is a row of elements in the periodic table.

Geology

• Geologic period, in geology

Mathematics

• Periodic function, in mathematics and electronics.
  • Doubly-periodic function
• Periodic point
  • Periodic points of complex quadratic mappings
• Recurring decimal
• Periodic group
• In a group, the period of an element a is the smallest integer n such that aⁿ = e, the identity.

Physics

• In physics, a period is an interval of time between the recurrence of phases in a vibration, waveform etc.

Astronomy

• Orbital period, in astronomy

Optics

• Periodic poling

Period is also the name of the final novel in Dennis Cooper's George Miles Cycle.

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