semi-major axis

A form of semimajor axis — Half of the major axis of a circle or ellipse.

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Meanings

nounsemi-major axis (plural semi-major axes)

plural semi-major axes

  1. alternativeAlternative form of semimajor axis.
Cite this entry
APA

semi-major axis. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/semi-major%20axis

MLA

“semi-major axis.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/semi-major%20axis. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “semi-major axis,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/semi-major%20axis.

Source: semi-major axis on Wiktionary, CC BY-SA 4.0.