Definition of axis noun from the Oxford Advanced American Dictionary



    (pl. axes
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  1. 1an imaginary line through the center of an object, around which the object turns Mars takes longer to revolve on its axis than the earth does.
  2. 2 (technology) a fixed line against which the positions of points are measured, especially points on a graph the vertical/horizontal axis The real cost is measured along the horizontal axis and the quantity of labor is measured along the vertical axis. The main road is on a north-south axis.
  3. 3(geometry) a line that divides a shape into two equal parts an axis of symmetry The axis of a circle is its diameter.
  4. 4 [usually singular] (formal) an agreement or alliance between two or more countries the Axis Powers of World War II
See the Oxford Advanced Learner's Dictionary entry: axis