n. 1 Math. the process of constructing a square with an area equal to that of a figure bounded by a curve, e.g. a circle. 2 Astron. a each of two points at which the moon is 90ø from the sun as viewed from earth. b the position of a heavenly body in relation to another 90ø away.
[ F quadrature or L quadratura (as QUADRATE) ]