# Definition of quadrature

**quadrature**Noun the process of making something square; squaring**quadrature**Noun [http://mathworld.wolfram.com/Quadrature.html]**quadrature**Noun a situation in which three celestial bodies form a right-angled triangle, the observer being located at the right angle**quadrature**Noun the condition in which the phase angle between two alternating quantities is 90°