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Meaning of quadrature

quad•ra•ture

Pronunciation: (kwod'ru-chur, -choor"), [key]
— n.
  1. the act of squaring.
    1. the act or process of finding a square equal in area to a given surface, esp. a surface bounded by a curve.
    2. the act or process of finding an area or calculating an integral, esp. 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.
  2. the relation between two signals having the same frequency that differ in phase by 90°.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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