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 quadrate; a square.

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.

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