Definitions for "Vernal Equinox"
Point of intersection on the sky between the Sun's path (ecliptic) and the celestial equator, reached by the Sun on about March 21.
The place in the sky where the Sun crosses the celestial equator moving northwards. The vernal equinox falls on, or near, March 21, the first day of spring. See celestial sphere for a helpful diagram.
The equinox that occurs on or near March 21 each year. See also autumnal equinox equinox
(astronomy) the equinoctial point that lies in the constellation of Pisces