Period

From Wikipedia, the free encyclopedia

Period and periodic may refer to:

1. A full stop, also known as a school period, a punctuation mark which indicates 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.

Contents 1 Business 2 Education 3 History 4 Performing Arts 4.1 Music 5 Philosophy 6 Science 6.1 Biology 6.2 Chemistry 6.3 Geology 6.4 Mathematics 6.5 Physics 6.5.1 Astronomy 6.5.2 Optics 7 Literature

[edit] 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 situation. e.g. Payments, Receipts, Taxes - annually, quarterly or monthly. Salary or wages - monthly, fortnightly or weekly.

[edit] Education

• In schools, a period is the time allocated in the school timetable for instruction in a particular subject. Most government and private schools have six periods in a day, but some schools, such as MLC, have only four, with a study period making it five. A study period is time where students are intended to undertake self-directed study.

[edit] History

• Historical period

[edit] Performing Arts

• Period piece

[edit] Music

• Period (music)

[edit] Philosophy

• Periodic sentence

[edit] Science

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

[edit] Biology

• Menstrual cycle, relating to the reproductive system
• Gene for circadian rhythm - OMIM link

[edit] 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.

[edit] Geology

• Geologic period, in geology

[edit] Mathematics

• Periodic function, in mathematics and electronics.
• Simple harmonic motion
  • 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.
• Periods, a class of numbers

[edit] Physics

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

[edit] Astronomy

• Orbital period, in astronomy

[edit] Optics

• Periodic poling

[edit] Literature

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