1an imaginary line through the centre of an object, around which the object turnsMars takes longer to revolve on its axis than the Earth.2(technical) a fixed line against which the positions of points are measured, especially points on a graphthe vertical/horizontal axisThe real wage is measured along the horizontal axis and the quantity of labour is measured along the vertical axis.The main road is on a north-south axis.3(geometry) a line that divides a shape into two equal partsan axis of symmetryThe axis of a circle is its diameter.4[usually singular] (formal) an agreement or alliance between two or more countriesthe Franco-German axis
ˈæksɪs
ˈæksɪs