Usually means: Half of the longest diameter.
Definitions Related words Mentions
We found 18 dictionaries that define the word semimajor axis:

General (11 matching dictionaries)
  1. semimajor axis: Merriam-Webster
  2. semimajor axis: Oxford Learner's Dictionaries
  3. semimajor axis: Vocabulary.com
  4. semimajor axis: Wiktionary
  5. semimajor axis: Infoplease Dictionary
  6. semimajor axis: Dictionary.com
  7. Semimajor axis: Wikipedia, the Free Encyclopedia
  8. semimajor axis: Rhymezone
  9. semimajor axis: FreeDictionary.org
  10. semimajor axis: Mnemonic Dictionary
  11. semimajor axis: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. semimajor axis: Encyclopedia

Science (5 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Semimajor Axis: Eric Weisstein's World of Mathematics
  3. Semimajor axis: Glossary on Meteor Astronomy
  4. Imagine the Universe! Dictionary (No longer online)
  5. semimajor axis: Nine Planets Glossary

Tech (1 matching dictionary)
  1. High-Energy Astrophysics (No longer online)

Definitions from Wiktionary (semimajor axis)

noun:  (geometry) Half of the major axis of a circle or ellipse.
noun:  (geometry) Half of the distances between the two branches of a hyperbola.

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