Axis (Disambiguation)

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