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Definition of Vernal equinox
1. Noun. March 21. 
Exact synonyms: March Equinox, Spring Equinox
Group relationships: Mar, March, Spring, Springtime
Generic synonyms: Equinox
Specialized synonyms: Noruz, Nowrooz, Nowruz
Antonyms: Autumnal Equinox
Group relationships: Mar, March, Spring, Springtime
Generic synonyms: Equinox
Specialized synonyms: Noruz, Nowrooz, Nowruz
Antonyms: Autumnal Equinox
2. Noun. (astronomy) the equinoctial point that lies in the constellation of Pisces.




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