1. Noun
The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.
2. Noun
Equinoctial wind or storm.
3. Noun
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
Vocabulary classified under Physics
More about this word
Synonyms and related words
Explore this word