| equin | a violent rainstorm near the time of an equinox |
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| equin | the time for the earth to make one revolution around the sun, measured between two vernal equinoxes |
| equin | (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic |
| equin | 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 |