semimajor axis

noun semi·ma·jor axis \ ˌse-mē-ˈmā-jər- , ˌse-ˌmī- , -mi- \

Definition of semimajor axis

: one half of the major axis of an ellipse (such as that formed by the orbit of a planet)

First Known Use of semimajor axis

1818

in the meaning defined above

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a large number

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