Online. Axis Page Published on Tuesday, April 29, 1997 by Gideon Ariel Axis An axis, or coordinate axis, is one of a set of vectors that defines a coordinate system. In a Cartesian coordinate system, the coordinate axes represent the spans of the basis vectors of the system. In a spherical coordinate system, coordinate axes are lines along which the angular coordinates are zero. See also 2DTwo-dimensional coordinate system3DThree-dimensional coordinate systemAngleDefinition of an angleAxisDefinition of Cartesian axisCartesian geometryWhat is Cartesian geometry?Coordinate systemDefinition of coordinatesCurveDefinition of a curveDistanceDefinition of distanceEuclidean geometryWhat is Euclidean geometry?GeometryDefinition of geometryLengthDefinition of lengthLineDefinition of a lineOriginDefinition of origin in a Cartesian coordinate systemPerspective projectionDefinition of perspective projectionPlanar homographyDefinition of planar homographyPlaneDefinition of a planePointDefinition of a pointPoint (kinematics)Definition of a point (kinematics)Projective geometryWhat is projective geometry?Segment (kinematics)Definition of a segment (kinematics)Vanishing pointsDefinition of vanishing points and vanishing lines in perspective projectionVectorDefinition of a vector Reference: /wizard/manual/concepts/geometry.axis.html