quadrature(noun)

the construction of a square having the same area as some other figure

quadrature(Noun)

the process of making something square; squaring

quadrature(Noun)

a situation in which three celestial bodies form a right-angled triangle, the observer being located at the right angle

When the Moon is in quadrature, it appears in the sky as a half-moon.

quadrature(Noun)

the condition in which the phase angle between two alternating quantities is 90u00B0

quadrature(Noun)

A painting painted on a wooden panel

Quadrature(adj)

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

Quadrature(adj)

a quadrate; a square

Quadrature(adj)

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

Quadrature(adj)

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.

Quadrature

Waves or periodic motions the angle of lag of one of which, with reference to one in advance of it, is 90°, are said to be in quadrature with each other. [Transcriber's note: If the voltage and current of a power line are in quadrature, the power factor is zero (cos(90°) = 0)  and no real power is delivered to the load.]