Quadrature

Quadrature, derived from Latin quadrare, may refer to: In signal processing:Quadrature amplitude modulation (QAM), a modulation method of using both a carrier wave and a 'quadrature' carrier wave that is 90° out of phase with the main carrierQuadrature phase, oscillations that are said to be in quadrature if they are separated in phase by 90° (π/2, or λ/4)Quadrature filter, the analytic signal of a real-valued filterQuadrature coupler, see under chapter five in Power dividers and directional couplers
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Noun
1. the construction of a square having the same area as some other figure
(hypernym) construction

n. quadrature

n. squaring

(a.)
The position of one heavenly body in respect to another when distant from it 90¡, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition.
  

(a.)
The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable.
  

(a.)
The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas.
  

(a.)
A quadrate; a square.