Webster's English Dictionary

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equinoctial

1. equi.noc.tial \.e--kw*-'na:k-sh*l, .ek-w*-\ aj 1: relating to an equinox 
   or to a state or the time of equal day and night  2: relating to the 
   regions or climate of the equinoctial line or equator  3: relating to the 
   time when the sun passes an equinoctial point 
2. equinoctial n 1: EQUATOR  2: an equinoctial storm