(geometry) An imaginary line around which an object spins (an axis of rotation) or is symmetrically arranged (an axis of symmetry).

A deer native to Asia, of species Axis axis.

The alliance (in effect before and during World War II) of Germany, Italy, Japan, and several minor allied countries, which opposed the Allies.

Relating to the axis

(astronomy) The axis of Earth between the celestial poles, important in ancient geocentric coordinate systems.

A chord progression, I–V–vi–IV, used in Western popular music, common since the 1970s.

(algebraic geometry) The axis on a graph that is usually drawn left to right and usually shows the range of values of an independent variable.

A group of states accused by George W. Bush of sponsoring terrorism and seeking weapons of mass destruction, originally defined as Iran, Iraq, and North Korea.

(geometry) The longest diameter of an ellipse, running through the center and foci, with its ends being the widest points of the shape. / (geometry) The diameter of a circle.

(geometry) Half of the major axis of a circle or ellipse. / (geometry) Half of the distances between the two branches of a hyperbola.