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[kwod-ruh-cher, -choo r] /ˈkwɒd rə tʃər, -ˌtʃʊər/
the act of squaring.
  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.
  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.
Electronics. the relation between two signals having the same frequency that differ in phase by 90°.
Origin of quadrature
1545-55; < Latin quadrātūra, equivalent to quadrāt(us) (past participle of quadrāre; see quadrate) + -ūra -ure Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for quadrature


(maths) the process of determining a square having an area equal to that of a given figure or surface
the process of making square or dividing into squares
(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
(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
  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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