# quadrature

[kwod-ruh-cher, -choo r]

- the act of squaring.
- Mathematics.
- the act or process of finding a square equal in area to a given surface, especially a surface bounded by a curve.
- the act or process of finding an area or calculating an integral, especially by numerical methods.
- a definite integral.

- Astronomy.
- the situation of two heavenly bodies when their longitudes differ by 90°.
- either of the two points in the orbit of a body, as the moon, midway between the syzygies.
- (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°.

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## Origin of quadrature^{}

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for quadrature

### Historical Examples

#### Possibly the one who wrote on the quadrature of the circle in 1881.

A Budget of Paradoxes, Volume II (of II)Augustus de Morgan

#### More curious than his quadrature is his name; what are we to make of it?

A Budget of Paradoxes, Volume I (of II)Augustus De Morgan

#### In six dialogues: the sixth contains a quadrature of the circle.

A Budget of Paradoxes, Volume I (of II)Augustus De Morgan

#### His attempt to prove the impossibility of the quadrature appeared in 1645.

A Budget of Paradoxes, Volume I (of II)Augustus De Morgan

#### He carried the quadrature of the circle to 120 decimal places.

The Every Day Book of History and ChronologyJoel Munsell

## 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

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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

## quadrature

[kwŏd′rə-chur′]

- The process of constructing a square equal in area to a given surface.
- 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.

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The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.