axis

US /ˈæk.sɪs/
UK /ˈæk.sɪs/
"axis" picture
1.

an imaginary line about which a body rotates or around which a body or structure is symmetrically arranged

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The Earth rotates on its axis.
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The bridge was designed with a central axis.
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pivotfulcrumcenter
2.

a fixed reference line for the measurement of coordinates

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Plot the points on the x-axis and y-axis.
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The graph shows temperature on the vertical axis.
3.

a real or imaginary straight line passing through a body and indicating its position or orientation

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The spinal column forms the main axis of the body.
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The plant's main stem is its central axis.
4.

an alliance between two or more countries for coordinating efforts, especially in a war

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The Axis powers during World War II included Germany, Italy, and Japan.
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The two nations formed an axis to counter regional threats.
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alliancecoalitionblocpact