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  • In numerical analysis, a quadrature rule is an approximation of the definite integral of a function, usually stated as a weighted sum of function values at specified points within the domain of integration. ( See numerical integration for more on quadrature rules. — “Gaussian quadrature - Wikipedia, the free encyclopedia”,
  • Quadrature phase-shift keying (QPSK), a phase-shift keying of using four quadrate points on the constellation diagram, equispaced around a circle Quadrature (mathematics), drawing a square with the same area as a given plane figure (squaring) or computing that area. — “Quadrature - Wikipedia, the free encyclopedia”,
  • Quadrature amplitude modulation (QAM) (pronounced /ˈkwɑːm/ or /ˈkæm These two waves, usually sinusoids, are out of phase with each other by 90° and are thus called quadrature carriers or quadrature components — hence the name of the scheme. — “Quadrature amplitude modulation - Wikipedia, the free”,


  • Whoever, also, should hereunto join the geometrical propositions that, by the certainty of their demonstrations, conclude the contained to be greater than the containing, the centre to be as great as its circumference, and that find out two lines incessantly approaching each other, which yet can never meet, and the philosopher's stone, and the quadrature of the circle, where the reason and the effect are so opposite, might, peradventure, find some argument to second this bold saying of Pliny:... — “Essays” by Michel de Montaigne


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