Quadrature
- Addition in quadrature
- Gaussian quadrature
- Illusionistic ceiling painting
- Just a Souvenir
- La Quadrature du Net
- Numerical integration
- Optical phase space
- Quadrature (astronomy)
- Quadrature (differential equations)
- Quadrature (mathematics)
- Quadrature amplitude modulation
- Quadrature component
- Quadrature encoder
- Quadrature filter
- Quadrature of the Parabola
- Quadrature of the hyperbola
- Quadrature phase
- Quadrature phase-shift keying
- Squaring the circle