quadrature

noun

1. the act of squaring.
2. Mathematics.
   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.
3. Astronomy.
   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.
4. Electronics. the relation between two signals having the same frequency that differ in phase by 90°.