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major axis

American  

noun

Mathematics.
  1. the axis of an ellipse that passes through the two foci.


major axis British  

noun

  1. the longer or longest axis of an ellipse or ellipsoid

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of major axis

First recorded in 1850–55

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

When b > a, the major axis is vertical so the distance from the center to the vertex is b.

From Textbooks • May 6, 2020

The result is to make the major axis of Mercury’s orbit rotate slowly in space because of the Sun’s gravity alone.

From Textbooks • Oct. 13, 2016

If the major axis of an ellipse is 16 cm, what is the semimajor axis?

From Textbooks • Oct. 13, 2016

The major axis of the orbit of a planet, such as Mercury, rotates in space slightly because of various perturbations.

From Textbooks • Oct. 13, 2016

In contrast, the major axis of Eurasia is east-west.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

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