Pronunciation: (kwod'ru-chur, -choor"),[key] —n. 1. the act of squaring.
2. Math. a. the act or process of finding a square equal in area to a given surface, esp. a surface bounded by a curve.
b. the act or process of finding an area or calculating an integral, esp. by numerical methods.
c. a definite integral.
3. Astron. a. the situation of two heavenly bodies when their longitudes differ by 90°.
b. either of the two points in the orbit of a body, as the moon, midway between the syzygies.
c. (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°.