Definition of equinoctial
(Entry 1 of 2)
1
: relating to an equinox or to a state or the time of equal day and night
2
: relating to the regions or climate on or near the equator
3
: relating to the time when the sun passes an equinoctial point
equinoctial
nounDefinition of equinoctial (Entry 2 of 2)
1
: equator sense 1
2
: an equinoctial storm
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Merriam-Webster unabridged
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Time Traveler for equinoctial
The first known use of equinoctial was in 1521
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