资料来源 : Webster's Revised Unabridged Dictionary (1913)

Occasive \Oc*ca"sive\, a. [L. occasivus, fr. occasus a going
   down, setting of the heavenly bodies, fr. occidere to fall or
   down. See {Occasion}.]
   Of or pertaining to the setting sun; falling; descending;
   western.