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Noun: autumnal equinox  o'túm-nul 'ee-kwu,nóks
  1. (astronomy) the equinoctial point that lies in the constellation of Virgo
    "The autumnal equinox occurs around September 22nd each year"
     
  2. September 22
    "The autumnal equinox marks the beginning of fall in the Northern Hemisphere";
    - September equinox, fall equinox

Derived forms: autumnal equinoxes

Type of: equinoctial point, equinox

Part of: autumn, fall [N. Amer], Sep, Sept, September

Encyclopedia: Autumnal equinox