Axis may refer to
- Y-axis, the vertical line in a coordinate plane
- X-axis, the horizontal line in a coordinate plane
- Semimajor axis, the longest semidiameter of a conic section
- Semiminor axis, the shortest semidiameter of a conic section
- Major axis, the longest diameter of a conic section
- Minor axis, the shortest diameter of a conic section
- Real axis, the horizontal line in the complex plane
- Imaginary axis, the vertical line in the complex plane
- Radical axis, a useful geometry tool that is applicable in many places
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