Axis

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 longer semidiameter of a conic section
• Semiminor axis, the shorter semidiameter of a conic section
• Major axis, the longer diameter of a conic section
• Minor axis, the shorter 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 geometric method involving circles

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