[n] - the construction of a square having the same area as some other figure

A mathematical term used in radio modulation to mean a four way choice, for example the four phase choices in QPSK (quadrature phase shift keying)
Found op http://www.encyclo.co.uk/visitor-contributions.php

The position of the Moon or another planet when it is at right angles to the Sun as seen from Earth. An example would be when the Moon is seen at First or Last Quarter phases.
Found op http://www.delscope.demon.co.uk/astronomy/glossary.htm

Quad'ra·ture noun [ Latin quadratura : confer French quadrature . See Quadrate , adjective ] 1. (Math.) The act of squaring; the finding of a square having the same area as some given curvilin...
Found op http://www.encyclo.co.uk/webster/Q/1

1. <mathematics> The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the...

noun the construction of a square having the same area as some other figure

• (a.) The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of ab...

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 ...
Found op http://www.britannica.com/eb/a-z/q/3

in mathematics, the process of determining the area of a plane geometric figure by dividing it into a collection of shapes of known area (usually ... [2 related articles]
Found op http://www.britannica.com/eb/a-z/q/3

[mathematics] Quadrature — historical mathematical term which means calculating of the area. Quadrature problems have served as one of the main sources of mathematical analysis. == History == Problems of quadrature for curvilinear figures are much more difficult. The quadrature of the circ...

• (astron.) The configuration when the Moon or a planet lies at angular distance of 90° east or west of the Sun as seen from Earth. • (math.) The determination of the area of a geometric figure. • GEOMETRY

quadrature, in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a planet is in quadrature when its elongation is 90°. As viewed from the earth, the half-moon is in ...

In astronomy, quadrature is the position of the moon or a planet when its longitude differs from that of the sun by 90 degrees.
Found op http://www.probertencyclopaedia.com/browse/GQ.HTM

Term that describes two celestial bodies appearing to be ninety degrees apart, from the perspective of the observer. An example is when the Moon appears to be at a right angle to the Sun, as viewed from Earth.
Found op http://www.moonconnection.com/moon-glossary.phtml

[astronomy] In astronomy, quadrature is that aspect of a heavenly body in which it makes a right angle with the direction of the Sun. It is applied especially to the apparent position of a superior planet, or of the Moon at first and last quarters. As shown in the following diagram, a planet...

A point in the orbit of a superior planet where it appears at right angles to the Sun as seem from Earth.

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