WordRel.com

• (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

  synonym	equinoctial point
  domain topic	astronomyuranology
  hypernym	celestial point
  hyponym	autumnal equinoxvernal 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

  derivation	equinoctial
  hypernym	cosmic time
  hyponym	autumnal equinoxfall equinoxMarch equinoxSeptember equinoxspring equinoxvernal equinox