Usually means: Day and night equally long.
Definitions Related words Phrases Mentions
We found 22 dictionaries that define the word autumnal equinox:

General (13 matching dictionaries)
  1. autumnal equinox: Oxford Learner's Dictionaries
  2. autumnal equinox: American Heritage Dictionary of the English Language
  3. autumnal equinox: Collins English Dictionary
  4. autumnal equinox: Vocabulary.com
  5. autumnal equinox: Wordnik
  6. autumnal equinox: Wiktionary
  7. autumnal equinox: Infoplease Dictionary
  8. autumnal equinox: Dictionary.com
  9. Autumnal Equinox, Autumnal equinox (disambiguation), Autumnal equinox: Wikipedia, the Free Encyclopedia
  10. autumnal equinox: Rhymezone
  11. autumnal equinox: FreeDictionary.org
  12. autumnal equinox: Mnemonic Dictionary
  13. autumnal equinox: TheFreeDictionary.com

Business (1 matching dictionary)
  1. autumnal equinox: Legal dictionary

Computing (1 matching dictionary)
  1. autumnal equinox: Encyclopedia

Science (3 matching dictionaries)
  1. Autumnal Equinox: Eric Weisstein's World of Astronomy
  2. Autumnal Equinox: Extragalactic Astronomy
  3. AUTUMNAL EQUINOX: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. Autumnal Equinox: Urban Dictionary

Tech (3 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. National Weather Service Glossary (No longer online)
  3. SOLAR-TERRESTRIAL TERMS (No longer online)

Definitions from Wiktionary (autumnal equinox)

noun:  (astronomy) The moment when the sun appears to cross the celestial equator while tilting away from the observer, taking place in September in the northern hemisphere and March in the southern hemisphere.

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