Last Updated
：2025/11/22
semimajor axis
（ plural ）
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(geometry) Half of the major axis of a circle or ellipse. / (geometry) Half of the distances between the two branches of a hyperbola.
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semimajor axis
The semimajor axis of the ellipse is half the length of its major axis.
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The semimajor axis of the ellipse is half the length of its major axis.
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