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4 reference results for: Period

Columbia Encyclopedia

period: see punctuation.

The Columbia Electronic Encyclopedia Copyright © 2004, Columbia University Press.
Licensed from Columbia University Press

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Sponsored Links Abnormal periods
Relax. Take a deep breath. We have the answers you seek.
www.RightHealth.com/PMS

Know Your Body - Period
Access to Answers, Info, Forums On Know Your Body - Period & More.
RevolutionHealth.com

Irregular Periods?
Over 35, it may be perimenopause. Take our free on-line assessment.
www.womentowomen.com

Columbia Encyclopedia

period, in physics: see harmonic motion; wave.

The Columbia Electronic Encyclopedia Copyright © 2004, Columbia University Press.
Licensed from Columbia University Press

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Columbia Encyclopedia

period, unit of time on the geologic timescale. Periods are shorter than an era and longer than an epoch. Periods are of variable length, generally lasting tens of millions of years, with characteristic fossils found preserved in the sediments deposited during the period. It is also used to designate a characteristic of geologic time, such as the glacial period.

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Wikipedia

Period or periodic may refer to:

Language and literature

Full stop, a punctuation mark indicating the end of a sentence or phrase
Periodic sentence, a sentence that is not grammatically complete until its end
The final book in Dennis Cooper's George Miles cycle of novels

Science and mathematics

Menstruation, a phase of the menstrual cycle in which the uterine lining is shed
Orbital period, a concept in astronomy
Period (gene), a gene in Drosophila involved in regulating circadian rhythm
Period (geology), a subdivision of geologic time
Period (number), a concept in mathematics
Period (periodic table), a horizontal row of the periodic table
Periodic acid, an oxoacid of iodine
In physics, period the reciprocal of frequency

Other meanings

Period (music), a concept in musical composition
Periodicity, the quality of occurring at regular intervals
For historical period, see List of time periods

Language and literature

Science and mathematics

Other meanings

See also