autumnal equinox

Pronunciation:			o'tumnl 'eekwu`nâks
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WordNet Dictionary
	Definition:		[n]  (astronomy) the equinoctial point that lies in the constellation of Virgo [n]  September 22
	Synonyms:		fall equinox, September equinox
	Antonyms:		March equinox, spring equinox, vernal equinox
	See Also:		autumn, equinoctial point, equinox, equinox, fall