|part of speech:
||one quarter of the arc of a circle.
||the area of a circle that is enclosed by such an arc and by the radii at either end of it.
||in the standard Cartesian coordinate system, one of the four regions into which the vertical and horizontal axes divide the plane.
||any of the four parts that result when an area is divided by two lines, real or imaginary, that intersect each other at right angles.
There is a police precinct in each of the city's four quadrants.
||an apparatus formerly used to measure the altitude of celestial objects, esp. for navigation.