- equinoctial⇄adj. 1. having to do with an equinox, or with a state when day and night are of equal length in all parts of the earth.
2. occurring at the time of an equinox: ?equinoctial storms.
Ex. The equinoctial seasons (when the sun is directly over t - equinoctial⇄equinoctial, adjective, noun.
- equinoctial⇄noun 1. celestial equator.
2. a storm or gale occurring at or near an equinox.