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quadrature

[kwod-ruh-cher, -choo r] /ˈkwɒd rə tʃər, -ˌtʃʊər/
noun
1.
the act of squaring.
2.
Mathematics.
  1. the act or process of finding a square equal in area to a given surface, especially a surface bounded by a curve.
  2. the act or process of finding an area or calculating an integral, especially by numerical methods.
  3. a definite integral.
3.
Astronomy.
  1. the situation of two heavenly bodies when their longitudes differ by 90°.
  2. either of the two points in the orbit of a body, as the moon, midway between the syzygies.
  3. (of the moon) those points or moments at which a half moon is visible.
4.
Electronics. the relation between two signals having the same frequency that differ in phase by 90°.
Origin
1545-1555
1545-55; < Latin quadrātūra, equivalent to quadrāt(us) (past participle of quadrāre; see quadrate) + -ūra -ure
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for quadrature
  • Adaptive quadrature programs being recursive by nature, the choice of a good termination criterion is given particular attention.
  • The electromagnetic survey was performed in horizontal co-planar mode, measuring both the quadrature and inphase component.
  • The question of integration grid or quadrature scheme is important for the evaluation this equation.
British Dictionary definitions for quadrature

quadrature

/ˈkwɒdrətʃə/
noun
1.
(maths) the process of determining a square having an area equal to that of a given figure or surface
2.
the process of making square or dividing into squares
3.
(astronomy) a configuration in which two celestial bodies, usually the sun and the moon or a planet, form an angle of 90° with a third body, usually the earth
4.
(electronics) the relationship between two waves that are 90° out of phase
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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quadrature in Science
quadrature
  (kwŏd'rə-chr')   
  1. The process of constructing a square equal in area to a given surface.

  2. A configuration in which the position of one celestial body is 90° from another celestial body, as measured from a third. For example, the half moon lies in quadrature from the Sun when Earth is the reference point. See more at elongation.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for quadrature

in astronomy, that aspect of a heavenly body in which its direction as seen from the Earth makes a right angle with the direction of the Sun. The Moon at First or Last Quarter is said to be at east or west quadrature, respectively. A superior planet (outside the Earth's orbit) is at west quadrature when its position is 90 west of the Sun. It rises around midnight, reaches the meridian (a great circle on the celestial sphere, passing through the north and south poles and the zenith) near sunrise and sets near noon. At east quadrature the planet is near the meridian at sunset and sets near midnight. At both quadratures the planet is at gibbous phase (more than half but not all of the disk illuminated), but only Mars shows up conspicuously gibbous

Learn more about quadrature with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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