Most often in the plane, but also in the higher dimension spaces, the Cartesian coordinates are defined by a number (2 in the plane) of perpendicular number lines - coordinate axes. A point is then defined by its projections on the axes. In the plane, points are defined by 2 such projections that are written as an ordered pair of real numbers, (x, y).

A system in which points on a plane are identified by an ordered pair of numbers, representing the distances to two or three perpendicular axes.

Coordinate system in which the location of points in space are given by reference to three orthogonal planes, called coordinate planes.

A plane coordinate system in which the locations of points in space are expressed by reference to two or three planes, called the "coordinate planes" (x,y or x,y,z).

values that locate a point in two- or three-dimensional space. Each value represents units measured along an X, Y, or Z axis. See also Cartesian coordinate system.

The positions in space of the atoms in a molecule listed as triples (x, y, z).

The usual X Y Z coordinate system; with the axes at 90 degrees to each other.

A two coordinate geometry in which a point is located on an x, y grid whose axes are mutually perpendicular (akin to latitude and longitude on a Mercator chart).

A system of uniquely marking the position of a point on a plane [or in 3-dimensional space] -- by 2 [3] numbers (its "cartesian coordinates") giving its distances from 2 [3] mutually perpendicular lines ("cartesian axes"). The distances and the axes to which they are parallel are usually marked (x,y) in a plane and (x,y,z) in space; the "origin" is the point at which the axes intersect.

A measurement system for defining the position of a point with respect to two (or more) straight axes at right angles to each other. This is the commonest coordinate system, the main alternative being polar coordinates

are a system of positional reference in which location is measured along two or three orthogonal (perpendicular) axes. Every location can be defined uniquely by its X, Y, and Z coordinates. Locations in the coordinate system can be established using any unit of measurement such as meters, feet, and miles. Cartesian coordinates differ from latitude- longitude coordinates in that the latter comprise a spherical (rather than planar) reference system.

A Cartesian coordinate system is a rectangular coordinate system with two axes (x is the horizontal axis and y is the vertical axis). Every point on the plane can be located by an ordered pair (x,y), which notes its distance from the x-axis and from the y-axis. The axes meet at the origin, the point (0,0). It is named for RenĂ© Descartes.

coordinate system in which the locations of points in space are expressed by reference to three planes, called coordinate planes, no two of which are parallel. The three planes intersect in three straight lines, called coordinate axes. The coordinate planes and coordinate axes intersect in a common point, called the origin. From any point in space three straight lines may be drawn, each of which is parallel to one of the three coordinate axes; each of these lines will then intersect one (and only one) of the three coordinate planes. If , , denote these points of intersection, the Cartesian coordinates are the distances PA, PB, and PC. If the coordinate axes are mutually perpendicular, the coordinate system is rectangular; otherwise, oblique. In meteorology, the most common orientation of the , , rectangular Cartesian coordinates is such that the axis is directed toward the east, tangent to the earth's surface; the axis toward the north, tangent to the earth's surface; and the axis toward the local zenith, perpendicular to the earth's surface. Compare curvilinear coordinates.