• synonyms

semimajor axis

[sem-ee-mey-jer, sem-ahy-, sem-ee-, sem-ahy-]
See more synonyms for semimajor axis on Thesaurus.com
  1. Geometry. one half the major axis of an ellipse.
  2. Astronomy. one half the major axis of the ellipse that one celestial body describes around another, as a planet around the sun or a satellite around a planet, equivalent to the mean distance between the two bodies.
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Origin of semimajor axis

First recorded in 1925–30; semi- + major
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018