"equinoctial" in the noun sense
1. celestial equator, equinoctial circle, equinoctial line, equinoctial
the great circle on the celestial sphere midway between the celestial poles
"equinoctial" in the adjective sense
1. equinoctial
relating to the vicinity of the equator
2. equinoctial
relating to an equinox (when the lengths of night and day are equal)
Source: WordNet® (An amazing lexical database of English)
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