an imaginary line through the centre of an object, around which the object turns

a fixed line against which the positions of points are measured, especially points on a graph

the vertical/horizontal axis

The 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.

the speed is measured along the horizontal axis

a line that divides a shape into two equal parts

The axis of a circle is its diameter.

an agreement or alliance between two or more countries that forms the centre for a larger grouping of nations

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