equinoctial UK /ˌɛk.wɪˈnɒk.ʃəl/US /ˌiː.kwəˈnɑk.ʃəl/adjective 4noun 3forms 1 adjective4 •Of or relating to the spring or autumnal equinox.an equinoctial gale or storm, i.e. one happening at or near the time of the equinox, in any part of the world •Of or relating to the celestial equator. •Equatorial: of or relating to the equator of the Earth. •Of flowers: that open and close at particular times of day. noun3 •The great circle midway between the celestial poles; the celestial equator.The scorching beams under the equinoctial, or extremity of cold within the circle Arctic, […] cannot avoid or expel this heat, fury, and rage of mortal men. — 1624 •(rare) The terrestrial equator. •An equinoctial gale.Heavy with storm the coast-lines grew, / And sharp the equinoctials blew — 1868 formsequinoctials
