axis
//ˈæk.sɪs//
Noun
axisSingular
axesPlural
1
An imaginary straight line around which an object rotates or is symmetrically arranged.
The Earth rotates on its axis once every 24 hours.
2
A fixed reference line used for measuring coordinates in a graph or coordinate system.
The x-axis shows time, and the y-axis shows temperature.
3
A central or principal structure about which something turns or is arranged.
The spinal column serves as the central axis of the human body.
4
An alliance or agreement between two or more countries or parties.
The two nations formed an axis to strengthen their economic ties.