Dictionary.com

semimajor axis

[ sem-ee-mey-jer, sem-ahy-, sem-ee-, sem-ahy- ]
/ ˈsɛm iˈmeɪ dʒər, ˈsɛm aɪ-, ˌsɛm i-, ˌsɛm aɪ- /
Save This Word!

noun
Geometry. one half the major axis of an ellipse.
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.
QUIZ
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?

Origin of semimajor axis

First recorded in 1925–30; semi- + major
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use semimajor axis in a sentence

FEEDBACK