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period |
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period, in geologic timeperiod, unit of time on the geologic timescale geologic timescale, a chronological scale of earth's history used to measure the relative or absolute age of any part of geologic time. Of the numerous timescales, the most common is based on geologic time units, which divide time into eras, periods, and epochs...... Click the link for more information. . 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. period, in grammarperiod: see punctuation punctuation [Lat.,=point], the use of special signs in writing to clarify how words are used; the term also refers to the signs themselves. In every language, besides the sounds of the words that are strung together there are other features, such as tone, accent, and..... Click the link for more information. . period, in physicsperiod, in physics: see harmonic motion harmonic motion, regular vibration in which the acceleration of the vibrating object is directly proportional to the displacement of the object from its equilibrium position but oppositely directed...... Click the link for more information. ; wave wave, in physics, the transfer of energy by the regular vibration , or oscillatory motion, either of some material medium or by the variation in magnitude of the field vectors of an electromagnetic field (see electromagnetic radiation ). ..... Click the link for more information. . periodIn geology, the basic unit of the geologic time scale. During these spans of time, specific systems of rocks were formed. Originally, the method for defining the sequence of periods was relative; it was based on stratigraphy and paleontology. Carbon-14 dating and similar methods are now used to determine absolute ages for various periods. period 1. a nontechnical name for an occurrence of menstruation 2. Geology a unit of geological time during which a system of rocks is formed 3. a division of time, esp of the academic day 4. Physics Maths a. the time taken to complete one cycle of a regularly recurring phenomenon; the reciprocal of frequency. b. an interval in which the values of a periodic function follow a certain pattern that is duplicated over successive intervals 5. Astronomy a. the time required by a body to make one complete rotation on its axis b. the time interval between two successive maxima or minima of light variation of a variable star 6. Chem one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas 7. a complete sentence, esp a complex one with several clauses 8. Music a passage or division of a piece of music, usually consisting of two or more contrasting or complementary musical phrases and ending on a cadence 9. (in classical prosody) a unit consisting of two or more cola |
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perimeter perimeter net perinatal perineum Perino del Vaga period Period doubling period of time periodic group periodic law Periodic motion periodic table Periodic Table of the Elements: Actinium Periodic Table of the Elements: Aluminum Periodic Table of the Elements: Americium |
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