| autumnal equinox | | |
| n. | 1. autumnal equinox, fall equinox, september equinox | September 22. |
| ~ sep, sept, september | the month following August and preceding October. |
| ~ equinox | either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length. |
| ~ autumn, fall | the season when the leaves fall from the trees.; "in the fall of 1973" |
| n. | 2. autumnal equinox | (astronomy) the equinoctial point that lies in the constellation of Virgo. |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ equinoctial point, equinox | (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic. |
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