semimajor axis

noun semi·ma·jor axis \ ˌse-mē-ˈmā-jər- , ˌse-ˌmī- , -mi- \
Updated on: 11 Sep 2017

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


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