(n.) One of the elements of reference by which a point, as of a curve, is referred to a system of fixed rectilinear coordinate axes.

Cartesian coordinates abscissa apex azimuth ceiling clearance coordinates cylindrical coordinates declination elevation eminence equator coordinates exaltation hauteur height heighth highness latitude loftiness longitude ordinate peak perpendicular distance polar coordinates prominence right ascension stature sublimity summit tallness toploftiness