Usually means: Day and night nearly equal.
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We found 10 dictionaries that define the word September equinox:

General (8 matching dictionaries)
  1. September equinox: Vocabulary.com
  2. September equinox: Wiktionary
  3. september equinox: Dictionary.com
  4. September equinox: Wikipedia, the Free Encyclopedia
  5. September equinox: Rhymezone
  6. september equinox: FreeDictionary.org
  7. september equinox: Mnemonic Dictionary
  8. September equinox: TheFreeDictionary.com

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

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

Definitions from Wiktionary (September equinox)

noun:  (astronomy) The moment when the sun crosses the celestial equator while heading southward, occurring on September 22–23. That would be autumnal equinox in the northern hemisphere and vernal equinox in the southern hemisphere.

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