# Quadrature

## Quad"ra*ture

(?), n. [L.*quadratura*: cf. F.

*quadrature*. See Quadrate, a.] 1.

*(Math.)*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.

[1913 Webster]

2. A quadrate; a square.
*Milton.*

[1913 Webster]

3.
*(Integral Calculus)* 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.

[1913 Webster]

4.
*(Astron.)* 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.

[1913 Webster]

**Quadrature of the moon**
*(Astron.)*, the position of the moon when one half of the disk is illuminated. --
**Quadrature of an orbit**
*(Astron.)*, a point in an orbit which is at either extremity of the latus rectum drawn through the empty focus of the orbit.

[1913 Webster]

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Sun 16th December 2018