quadrature: Meaning and Definition of

quad•ra•ture

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.
4. the relation between two signals having the same frequency that differ in phase by 90°.