noun
- September 22.
- synonyms: September equinox, fall equinox
- Astronomy) the equinoctial point that lies in the constellation of Virgo. (.
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). autumnal equinox. Retrieved September 26, 2026, from http://smartdefine.org/autumnal_equinox/definitions/1224122 |
| Chicago | WordNet. 2010. "autumnal equinox" http://smartdefine.org/autumnal_equinox/definitions/1224122 (accessed September 26, 2026). |
| Harvard | WordNet 2010, autumnal equinox, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/autumnal_equinox/definitions/1224122>. |
| MLA | WordNet. "autumnal equinox" 23 October 2010. Web. 26 September 2026. <http://smartdefine.org/autumnal_equinox/definitions/1224122> |